diff --git a/Data/Sys/GameFiles/GALE01/GameSetup.dat b/Data/Sys/GameFiles/GALE01/GameSetup.dat
new file mode 100644
index 0000000000..2f6672becd
Binary files /dev/null and b/Data/Sys/GameFiles/GALE01/GameSetup.dat differ
diff --git a/Data/Sys/GameFiles/GALE01/GameSetup_gui.dat b/Data/Sys/GameFiles/GALE01/GameSetup_gui.dat
new file mode 100644
index 0000000000..03344765ae
Binary files /dev/null and b/Data/Sys/GameFiles/GALE01/GameSetup_gui.dat differ
diff --git a/Data/Sys/GameFiles/GALE01/MxDb.dat b/Data/Sys/GameFiles/GALE01/MxDb.dat
new file mode 100644
index 0000000000..0598993b50
Binary files /dev/null and b/Data/Sys/GameFiles/GALE01/MxDb.dat differ
diff --git a/Data/Sys/GameFiles/GALE01/MxScn.dat b/Data/Sys/GameFiles/GALE01/MxScn.dat
new file mode 100644
index 0000000000..a63207d0a6
Binary files /dev/null and b/Data/Sys/GameFiles/GALE01/MxScn.dat differ
diff --git a/Data/Sys/GameFiles/GALE01/SlippiCSS.dat b/Data/Sys/GameFiles/GALE01/SlippiCSS.dat
new file mode 100644
index 0000000000..2409f7cac0
Binary files /dev/null and b/Data/Sys/GameFiles/GALE01/SlippiCSS.dat differ
diff --git a/Data/Sys/GameFiles/GALE01/slpCSS.dat b/Data/Sys/GameFiles/GALE01/slpCSS.dat
index 138ef2ad02..f2c8638ea5 100644
Binary files a/Data/Sys/GameFiles/GALE01/slpCSS.dat and b/Data/Sys/GameFiles/GALE01/slpCSS.dat differ
diff --git a/Source/Core/Common/StringUtil.cpp b/Source/Core/Common/StringUtil.cpp
index 434523b6f2..bc782a0ca7 100644
--- a/Source/Core/Common/StringUtil.cpp
+++ b/Source/Core/Common/StringUtil.cpp
@@ -19,8 +19,8 @@
 #include <sstream>
 #include <string>
 #include <type_traits>
-#include <vector>
 #include <unordered_map>
+#include <vector>
 
 #include <fmt/format.h>
 
@@ -441,17 +441,20 @@ void StringPopBackIf(std::string* s, char c)
 // SLIPPITODO: look into boost locale maybe
 void ConvertNarrowSpecialSHIFTJIS(std::string& input)
 {
-  // Melee doesn't correctly display special characters in narrow form We need to convert them to wide form.
-  // I couldn't find a library to do this so for now let's just do it manually
+  // Melee doesn't correctly display special characters in narrow form We need to convert them to
+  // wide form. I couldn't find a library to do this so for now let's just do it manually
   static std::unordered_map<char, char16_t> specialCharConvert = {
-      {'!', (char16_t)0x8149}, {'"', (char16_t)0x8168}, {'#', (char16_t)0x8194},  {'$', (char16_t)0x8190},
-      {'%', (char16_t)0x8193}, {'&', (char16_t)0x8195}, {'\'', (char16_t)0x8166}, {'(', (char16_t)0x8169},
-      {')', (char16_t)0x816a}, {'*', (char16_t)0x8196}, {'+', (char16_t)0x817b},  {',', (char16_t)0x8143},
-      {'-', (char16_t)0x817c}, {'.', (char16_t)0x8144}, {'/', (char16_t)0x815e},  {':', (char16_t)0x8146},
-      {';', (char16_t)0x8147}, {'<', (char16_t)0x8183}, {'=', (char16_t)0x8181},  {'>', (char16_t)0x8184},
-      {'?', (char16_t)0x8148}, {'@', (char16_t)0x8197}, {'[', (char16_t)0x816d},  {'\\', (char16_t)0x815f},
-      {']', (char16_t)0x816e}, {'^', (char16_t)0x814f}, {'_', (char16_t)0x8151},  {'`', (char16_t)0x814d},
-      {'{', (char16_t)0x816f}, {'|', (char16_t)0x8162}, {'}', (char16_t)0x8170},  {'~', (char16_t)0x8160},
+      {'!', (char16_t)0x8149},  {'"', (char16_t)0x8168}, {'#', (char16_t)0x8194},
+      {'$', (char16_t)0x8190},  {'%', (char16_t)0x8193}, {'&', (char16_t)0x8195},
+      {'\'', (char16_t)0x8166}, {'(', (char16_t)0x8169}, {')', (char16_t)0x816a},
+      {'*', (char16_t)0x8196},  {'+', (char16_t)0x817b}, {',', (char16_t)0x8143},
+      {'-', (char16_t)0x817c},  {'.', (char16_t)0x8144}, {'/', (char16_t)0x815e},
+      {':', (char16_t)0x8146},  {';', (char16_t)0x8147}, {'<', (char16_t)0x8183},
+      {'=', (char16_t)0x8181},  {'>', (char16_t)0x8184}, {'?', (char16_t)0x8148},
+      {'@', (char16_t)0x8197},  {'[', (char16_t)0x816d}, {'\\', (char16_t)0x815f},
+      {']', (char16_t)0x816e},  {'^', (char16_t)0x814f}, {'_', (char16_t)0x8151},
+      {'`', (char16_t)0x814d},  {'{', (char16_t)0x816f}, {'|', (char16_t)0x8162},
+      {'}', (char16_t)0x8170},  {'~', (char16_t)0x8160},
   };
 
   int pos = 0;
@@ -476,13 +479,13 @@ void ConvertNarrowSpecialSHIFTJIS(std::string& input)
     input.erase(pos, 1);
 
     // Add new chars to pos to replace
-    auto newChars = (char*)& specialCharConvert[c];
+    auto newChars = (char*)&specialCharConvert[c];
     input.insert(input.begin() + pos, 1, newChars[0]);
     input.insert(input.begin() + pos, 1, newChars[1]);
   }
 }
 
-std::string ConvertStringForGame(const std::string& input, int length)
+std::string TruncateLengthChar(const std::string& input, int length)
 {
   auto utf32 = UTF8ToUTF32(input);
 
@@ -492,7 +495,12 @@ std::string ConvertStringForGame(const std::string& input, int length)
     utf32.resize(length);
   }
 
-  auto utf8 = UTF32toUTF8(utf32);
+  return UTF32toUTF8(utf32);
+}
+
+std::string ConvertStringForGame(const std::string& input, int length)
+{
+  auto utf8 = TruncateLengthChar(input, length);
   auto shiftJis = UTF8ToSHIFTJIS(utf8);
   ConvertNarrowSpecialSHIFTJIS(shiftJis);
 
diff --git a/Source/Core/Common/StringUtil.h b/Source/Core/Common/StringUtil.h
index 7dd79418d0..2389367663 100644
--- a/Source/Core/Common/StringUtil.h
+++ b/Source/Core/Common/StringUtil.h
@@ -178,6 +178,7 @@ std::u32string UTF8ToUTF32(const std::string& input);
 std::u32string UTF8ToUTF32(const std::string& input);
 #endif
 std::string UTF32toUTF8(const std::u32string& input);
+std::string TruncateLengthChar(const std::string& input, int length);
 std::string ConvertStringForGame(const std::string& input, int length);
 std::string CP1252ToUTF8(std::string_view str);
 std::string SHIFTJISToUTF8(std::string_view str);
diff --git a/Source/Core/Core/Config/MainSettings.cpp b/Source/Core/Core/Config/MainSettings.cpp
index 7efd061fdc..38e5e57e19 100644
--- a/Source/Core/Core/Config/MainSettings.cpp
+++ b/Source/Core/Core/Config/MainSettings.cpp
@@ -175,12 +175,21 @@ const Info<SerialInterface::SIDevices>& GetInfoForSIDevice(int channel)
 
 const Info<bool>& GetInfoForAdapterRumble(int channel)
 {
+#ifndef IS_PLAYBACK
   static const std::array<const Info<bool>, 4> infos{
       Info<bool>{{System::Main, "Core", "AdapterRumble0"}, true},
       Info<bool>{{System::Main, "Core", "AdapterRumble1"}, true},
       Info<bool>{{System::Main, "Core", "AdapterRumble2"}, true},
       Info<bool>{{System::Main, "Core", "AdapterRumble3"}, true},
   };
+#else
+  static const std::array<const Info<bool>, 4> infos{
+      Info<bool>{{System::Main, "Core", "AdapterRumble0"}, false},
+      Info<bool>{{System::Main, "Core", "AdapterRumble1"}, false},
+      Info<bool>{{System::Main, "Core", "AdapterRumble2"}, false},
+      Info<bool>{{System::Main, "Core", "AdapterRumble3"}, false},
+  };
+#endif
   return infos[channel];
 }
 
diff --git a/Source/Core/Core/GeckoCode.cpp b/Source/Core/Core/GeckoCode.cpp
index 2cea74253a..aa82fdff8c 100644
--- a/Source/Core/Core/GeckoCode.cpp
+++ b/Source/Core/Core/GeckoCode.cpp
@@ -170,6 +170,13 @@ static Installation InstallCodeHandlerLocked(const Core::CPUThreadGuard& guard)
   if (SConfig::GetSlippiConfig().melee_version == Melee::Version::NTSC ||
       SConfig::GetSlippiConfig().melee_version == Melee::Version::MEX)
   {
+    // Here we are replacing a line in the codehandler with a blr.
+    // The reason for this is that this is the section of the codehandler
+    // that attempts to read/write commands for the USB Gecko. These calls
+    // were sometimes interfering with the Slippi EXI calls and causing
+    // the game to loop infinitely in EXISync.
+    PowerPC::HostWrite_U32(guard, 0x4E800020, 0x80001D6C);
+
     // Write GCT loader into memory which will eventually load the real GCT into the heap
     std::string bootloaderData;
     std::string _bootloaderFilename = File::GetSysDirectory() + GCT_BOOTLOADER;
@@ -218,7 +225,7 @@ static Installation InstallCodeHandlerLocked(const Core::CPUThreadGuard& guard)
                        "not write: \"{}\". Need {} bytes, only {} remain.",
                        active_code.name, active_code.codes.size() * CODE_SIZE,
                        end_address - next_address);
-        continue;
+        return Installation::Failed;
       }
 
       for (const GeckoCode::Code& code : active_code.codes)
diff --git a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp
index c294279976..0f69f4284e 100644
--- a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp
+++ b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.cpp
@@ -255,6 +255,17 @@ CEXISlippi::~CEXISlippi()
 
   SlippiSpectateServer::getInstance().endGame(true);
 
+  // Try to determine whether we were playing an in-progress ranked match, if so
+  // indicate to server that this client has abandoned. Anyone trying to modify
+  // this behavior to game their rating is subject to get banned.
+  auto active_match_id = matchmaking->GetMatchmakeResult().id;
+  if (activeMatchId.find("mode.ranked") != std::string::npos)
+  {
+    ERROR_LOG(SLIPPI_ONLINE, "Exit during in-progress ranked game: %s", activeMatchId.c_str());
+    gameReporter->ReportAbandonment(activeMatchId);
+  }
+  handleConnectionCleanup();
+
   localSelections.Reset();
 
   g_playbackStatus->resetPlayback();
@@ -1538,7 +1549,10 @@ void CEXISlippi::handleOnlineInputs(u8* payload)
   m_read_queue.clear();
 
   s32 frame = Common::swap32(&payload[0]);
-  s32 finalizedFrame = Common::swap32(&payload[4]);
+  s32 finalized_frame = Common::swap32(&payload[4]);
+  u32 finalized_frame_checksum = Common::swap32(&payload[8]);
+  u8 delay = payload[12];
+  u8* inputs = &payload[13];
 
   if (frame == 1)
   {
@@ -1565,7 +1579,7 @@ void CEXISlippi::handleOnlineInputs(u8* payload)
     fallBehindCounter = 0;
     fallFarBehindCounter = 0;
 
-    // Reset character selections as they are no longer needed
+    // Reset character selections such that they are cleared for next game
     localSelections.Reset();
     if (slippi_netplay)
       slippi_netplay->StartSlippiGame();
@@ -1578,9 +1592,9 @@ void CEXISlippi::handleOnlineInputs(u8* payload)
   }
 
   // Drop inputs that we no longer need (inputs older than the finalized frame passed in)
-  slippi_netplay->DropOldRemoteInputs(finalizedFrame);
+  slippi_netplay->DropOldRemoteInputs(finalized_frame);
 
-  bool shouldSkip = shouldSkipOnlineFrame(frame, finalizedFrame);
+  bool shouldSkip = shouldSkipOnlineFrame(frame, finalized_frame);
   if (shouldSkip)
   {
     // Send inputs that have not yet been acked
@@ -1589,7 +1603,7 @@ void CEXISlippi::handleOnlineInputs(u8* payload)
   else
   {
     // Send the input for this frame along with everything that has yet to be acked
-    handleSendInputs(payload);
+    handleSendInputs(frame, delay, finalized_frame, finalized_frame_checksum, inputs);
   }
 
   prepareOpponentInputs(frame, shouldSkip);
@@ -1764,8 +1778,9 @@ bool CEXISlippi::shouldAdvanceOnlineFrame(s32 frame)
       // don't understand atm.
       OSD::AddTypedMessage(
           OSD::MessageType::PerformanceWarning,
-          "Your computer is running slow and is impacting the performance of the match.", 10000,
-          OSD::Color::RED);
+          "Possible poor match performance detected.\nIf this message appears with most opponents, "
+          "your computer or network is likely impacting match performance for the other players.",
+          10000, OSD::Color::RED);
     }
 
     if (offsetUs < -t2 && !isCurrentlyAdvancing)
@@ -1800,14 +1815,11 @@ bool CEXISlippi::shouldAdvanceOnlineFrame(s32 frame)
   return false;
 }
 
-void CEXISlippi::handleSendInputs(u8* payload)
+void CEXISlippi::handleSendInputs(s32 frame, u8 delay, s32 checksum_frame, u32 checksum, u8* inputs)
 {
   if (isConnectionStalled)
     return;
 
-  s32 frame = Common::swap32(&payload[0]);
-  u8 delay = payload[8];
-
   // On the first frame sent, we need to queue up empty dummy pads for as many
   // frames as we have delay
   if (frame == 1)
@@ -1819,7 +1831,7 @@ void CEXISlippi::handleSendInputs(u8* payload)
     }
   }
 
-  auto pad = std::make_unique<SlippiPad>(frame + delay, &payload[9]);
+  auto pad = std::make_unique<SlippiPad>(frame + delay, checksum_frame, checksum, inputs);
 
   slippi_netplay->SendSlippiPad(std::move(pad));
 }
@@ -1854,6 +1866,24 @@ void CEXISlippi::prepareOpponentInputs(s32 frame, bool shouldSkip)
   m_read_queue.push_back(remotePlayerCount);  // Indicate the number of remote players
 
   std::unique_ptr<SlippiRemotePadOutput> results[SLIPPI_REMOTE_PLAYER_MAX];
+
+  for (int i = 0; i < remotePlayerCount; i++)
+  {
+    results[i] = slippi_netplay->GetSlippiRemotePad(i, ROLLBACK_MAX_FRAMES);
+    // results[i] = slippi_netplay->GetFakePadOutput(frame);
+
+    // INFO_LOG(SLIPPI_ONLINE, "Sending checksum values: [%d] %08x", results[i]->checksumFrame,
+    // results[i]->checksum);
+    appendWordToBuffer(&m_read_queue, static_cast<u32>(results[i]->checksumFrame));
+    appendWordToBuffer(&m_read_queue, results[i]->checksum);
+  }
+  for (int i = remotePlayerCount; i < SLIPPI_REMOTE_PLAYER_MAX; i++)
+  {
+    // Send dummy data for unused players
+    appendWordToBuffer(&m_read_queue, 0);
+    appendWordToBuffer(&m_read_queue, 0);
+  }
+
   int offset[SLIPPI_REMOTE_PLAYER_MAX];
 
   int32_t latestFrameRead[SLIPPI_REMOTE_PLAYER_MAX]{};
@@ -1893,7 +1923,7 @@ void CEXISlippi::prepareOpponentInputs(s32 frame, bool shouldSkip)
     std::vector<u8> tx;
 
     // Get pad data if this remote player exists
-    if (i < remotePlayerCount)
+    if (i < remotePlayerCount && offset[i] < results[i]->data.size())
     {
       auto txStart = results[i]->data.begin() + offset[i];
       auto txEnd = results[i]->data.end();
@@ -2185,12 +2215,71 @@ void CEXISlippi::handleNameEntryLoad(u8* payload)
   appendWordToBuffer(&m_read_queue, curIndex);
 }
 
+// teamId 0 = red, 1 = blue, 2 = green
+int CEXISlippi::getCharColor(u8 charId, u8 teamId)
+{
+  switch (charId)
+  {
+  case 0x0:  // Falcon
+    switch (teamId)
+    {
+    case 0:
+      return 2;
+    case 1:
+      return 5;
+    case 2:
+      return 4;
+    }
+  case 0x2:  // Fox
+    switch (teamId)
+    {
+    case 0:
+      return 1;
+    case 1:
+      return 2;
+    case 2:
+      return 3;
+    }
+  case 0xC:  // Peach
+    switch (teamId)
+    {
+    case 0:
+      return 0;
+    case 1:
+      return 3;
+    case 2:
+      return 4;
+    }
+  case 0x13:  // Sheik
+    switch (teamId)
+    {
+    case 0:
+      return 1;
+    case 1:
+      return 2;
+    case 2:
+      return 3;
+    }
+  case 0x14:  // Falco
+    switch (teamId)
+    {
+    case 0:
+      return 1;
+    case 1:
+      return 2;
+    case 2:
+      return 3;
+    }
+  }
+  return 0;
+}
+
 void CEXISlippi::prepareOnlineMatchState()
 {
   // This match block is a VS match with P1 Red Falco vs P2 Red Bowser vs P3 Young Link vs P4 Young
   // Link on Battlefield. The proper values will be overwritten
   static std::vector<u8> onlineMatchBlock = {
-      0x32, 0x01, 0x86, 0x4C, 0xC3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0x6E, 0x00,
+      0x32, 0x01, 0x86, 0x4C, 0xC3, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0xFF, 0xFF, 0x6E, 0x00,
       0x1F, 0x00, 0x00, 0x01, 0xE0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
       0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x00, 0x00, 0x3F,
       0x80, 0x00, 0x00, 0x3F, 0x80, 0x00, 0x00, 0x3F, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
@@ -2247,10 +2336,11 @@ void CEXISlippi::prepareOnlineMatchState()
       slippi_netplay = matchmaking->GetNetplayClient();
 #endif
 
-      // This happens on the initial connection to a player. Let's now grab the allowed stages
-      // returned to us from the matchmaking service and pick a new random stage before sending
-      // the selections to the opponent
-      allowedStages = matchmaking->GetStages();
+      // This happens on the initial connection to a player. The matchmaking object is ephemeral, it
+      // gets re-created when a connection is terminated, that said, it can still be useful to know
+      // who we were connected to after they disconnect from us, for example in the case of
+      // reporting a match. So let's copy the results.
+      allowedStages = recentMmResult.stages;
       // Clear stage pool so that when we call getRandomStage it will use full list
       stagePool.clear();
       localSelections.stageId = getRandomStage();
@@ -2305,16 +2395,7 @@ void CEXISlippi::prepareOnlineMatchState()
     // Here we are connected, check to see if we should init play session
     if (!is_play_session_active)
     {
-      std::vector<std::string> uids;
-
-      auto mmPlayers = matchmaking->GetPlayerInfo();
-      for (auto mmp : mmPlayers)
-      {
-        uids.push_back(mmp.uid);
-      }
-
-      game_reporter->StartNewSession(uids);
-
+      game_reporter->StartNewSession();
       is_play_session_active = true;
     }
   }
@@ -2415,10 +2496,7 @@ void CEXISlippi::prepareOnlineMatchState()
       rps[i].isCharacterSelected = true;
     }
 
-    if (lastSearch.mode == SlippiMatchmaking::OnlinePlayMode::TEAMS)
-    {
-      remotePlayerCount = 3;
-    }
+    remotePlayerCount = lastSearch.mode == SlippiMatchmaking::OnlinePlayMode::TEAMS ? 3 : 1;
 
     oppName = std::string("Player");
 #endif
@@ -2433,25 +2511,39 @@ void CEXISlippi::prepareOnlineMatchState()
         remoteCharOk = false;
     }
 
-    // TODO: This is annoying, ideally remotePlayerSelections would just include everyone including
+    // TODO: Ideally remotePlayerSelections would just include everyone including the local player
     // the local player
     // TODO: Would also simplify some logic in the Netplay class
-    std::vector<SlippiPlayerSelections> orderedSelections(4);
-    orderedSelections[lps.playerIdx] = lps;
+    // Here we are storing pointers to the player selections. That means that we can technically
+    // modify the values from here, which is probably not the cleanest thing since they're coming
+    // from the netplay class. Unfortunately, I think it might be required for the overwrite stuff
+    // to work correctly though, maybe on a tiebreak in ranked?
+    std::vector<SlippiPlayerSelections*> orderedSelections(remotePlayerCount + 1);
+    orderedSelections[lps.playerIdx] = &lps;
     for (int i = 0; i < remotePlayerCount; i++)
     {
-      orderedSelections[rps[i].playerIdx] = rps[i];
+      orderedSelections[rps[i].playerIdx] = &rps[i];
+    }
+
+    // Overwrite selections
+    for (int i = 0; i < overwrite_selections.size(); i++)
+    {
+      const auto& ow = overwrite_selections[i];
+
+      orderedSelections[i]->characterId = ow.characterId;
+      orderedSelections[i]->characterColor = ow.characterColor;
+      orderedSelections[i]->stageId = ow.stageId;
     }
 
     // Overwrite stage information. Make sure everyone loads the same stage
     u16 stageId = 0x1F;  // Default to battlefield if there was no selection
     for (const auto& selections : orderedSelections)
     {
-      if (!selections.isStageSelected)
+      if (!selections->isStageSelected)
         continue;
 
       // Stage selected by this player, use that selection
-      stageId = selections.stageId;
+      stageId = selections->stageId;
       break;
     }
 
@@ -2505,11 +2597,11 @@ void CEXISlippi::prepareOnlineMatchState()
     INFO_LOG_FMT(SLIPPI_ONLINE, "Rng Offset: {:#x}", rngOffset);
 
     // Check if everyone is the same color
-    auto color = orderedSelections[0].teamId;
+    auto color = orderedSelections[0]->teamId;
     bool areAllSameTeam = true;
     for (const auto& s : orderedSelections)
     {
-      if (s.teamId != color)
+      if (s->teamId != color)
         areAllSameTeam = false;
     }
 
@@ -2526,21 +2618,21 @@ void CEXISlippi::prepareOnlineMatchState()
     // Overwrite player character choices
     for (auto& s : orderedSelections)
     {
-      if (!s.isCharacterSelected)
+      if (!s->isCharacterSelected)
       {
         continue;
       }
       if (areAllSameTeam)
       {
         // Overwrite teamId. Color is overwritten by ASM
-        s.teamId = teamAssignments[s.playerIdx];
+        s->teamId = teamAssignments[s->playerIdx];
       }
 
       // Overwrite player character
-      onlineMatchBlock[0x60 + (s.playerIdx) * 0x24] = s.characterId;
-      onlineMatchBlock[0x63 + (s.playerIdx) * 0x24] = s.characterColor;
-      onlineMatchBlock[0x67 + (s.playerIdx) * 0x24] = 0;
-      onlineMatchBlock[0x69 + (s.playerIdx) * 0x24] = s.teamId;
+      onlineMatchBlock[0x60 + (s->playerIdx) * 0x24] = s->characterId;
+      onlineMatchBlock[0x63 + (s->playerIdx) * 0x24] = s->characterColor;
+      onlineMatchBlock[0x67 + (s->playerIdx) * 0x24] = 0;
+      onlineMatchBlock[0x69 + (s->playerIdx) * 0x24] = s->teamId;
     }
 
     // Handle Singles/Teams specific logic
@@ -2573,8 +2665,7 @@ void CEXISlippi::prepareOnlineMatchState()
     *stage = Common::swap16(stageId);
 
     // Turn pause off in unranked/ranked, on in other modes
-    auto pauseAllowed = !SlippiMatchmaking::IsFixedRulesMode(lastSearch.mode) &&
-                        lastSearch.mode != SlippiMatchmaking::OnlinePlayMode::TEAMS;
+    auto pauseAllowed = lastSearch.mode == SlippiMatchmaking::OnlinePlayMode::DIRECT;
     u8* gameBitField3 = static_cast<u8*>(&onlineMatchBlock[2]);
     *gameBitField3 = pauseAllowed ? *gameBitField3 & 0xF7 : *gameBitField3 | 0x8;
     //*gameBitField3 = *gameBitField3 | 0x8;
@@ -2633,24 +2724,35 @@ void CEXISlippi::prepareOnlineMatchState()
   }
 
   // Create the opponent string using the names of all players on opposing teams
-  int teamIdx = onlineMatchBlock[0x69 + m_local_player_index * 0x24];
-  std::string oppText = "";
-  for (int i = 0; i < 4; i++)
+  std::vector<std::string> opponentNames = {};
+  if (matchmaking->RemotePlayerCount() == 1)
   {
-    if (i == m_local_player_index)
-      continue;
-
-    if (onlineMatchBlock[0x69 + i * 0x24] != teamIdx)
+    opponentNames.push_back(matchmaking->GetPlayerName(remotePlayerIndex));
+  }
+  else
+  {
+    int teamIdx = onlineMatchBlock[0x69 + localPlayerIndex * 0x24];
+    for (int i = 0; i < 4; i++)
     {
-      if (oppText != "")
-        oppText += "/";
+      if (localPlayerIndex == i || onlineMatchBlock[0x69 + i * 0x24] == teamIdx)
+        continue;
 
-      oppText += matchmaking->GetPlayerName(i);
+      opponentNames.push_back(matchmaking->GetPlayerName(i));
     }
   }
-  if (matchmaking->RemotePlayerCount() == 1)
-    oppText = matchmaking->GetPlayerName(m_remote_player_index);
-  oppName = ConvertStringForGame(oppText, MAX_NAME_LENGTH * 2 + 1);
+
+  auto numOpponents = opponentNames.size() == 0 ? 1 : opponentNames.size();
+  auto charsPerName = (MAX_NAME_LENGTH - (numOpponents - 1)) / numOpponents;
+  std::string oppText = "";
+  for (auto& name : opponentNames)
+  {
+    if (oppText != "")
+      oppText += "/";
+
+    oppText += TruncateLengthChar(name, charsPerName);
+  }
+
+  oppName = ConvertStringForGame(oppText, MAX_NAME_LENGTH);
   m_read_queue.insert(m_read_queue.end(), oppName.begin(), oppName.end());
 
 #ifdef LOCAL_TESTING
@@ -3003,6 +3105,9 @@ void CEXISlippi::handleConnectionCleanup()
   // Reset any forced errors
   forcedError.clear();
 
+  // Reset any selection overwrites
+  overwrite_selections.clear();
+
   // Reset play session
   is_play_session_active = false;
 
@@ -3022,29 +3127,50 @@ void CEXISlippi::prepareNewSeed()
   appendWordToBuffer(&m_read_queue, newSeed);
 }
 
-void CEXISlippi::handleReportGame(u8* payload)
+void CEXISlippi::handleReportGame(const SlippiExiTypes::ReportGameQuery& query)
 {
-#ifndef LOCAL_TESTING
   SlippiGameReporter::GameReport r;
-  r.duration_frames = Common::swap32(&payload[0]);
+  r.match_id = recentMmResult.id;
+  r.mode = static_cast<SlippiMatchmaking::OnlinePlayMode>(query.mode);
+  r.duration_frames = query.frame_length;
+  r.game_index = query.game_index;
+  r.tiebreak_index = query.tiebreak_index;
+  r.winner_idx = query.winner_idx;
+  r.stage_id = Common::FromBigEndian(*(u16*)&query.game_info_block[0xE]);
+  r.game_end_method = query.game_end_method;
+  r.lras_initiator = query.lras_initiator;
 
-  // ERROR_LOG_FMT(SLIPPI_ONLINE, "Frames: {}", r.duration_frames);
+  ERROR_LOG_FMT(SLIPPI_ONLINE,
+                "Mode: {} / {}, Frames: {}, GameIdx: {}, TiebreakIdx: {}, WinnerIdx: {}, "
+                "StageId: {}, GameEndMethod: {}, LRASInitiator: {}",
+                r.mode, query.mode, r.duration_frames, r.game_index, r.tiebreak_index, r.winner_idx,
+                r.stage_id, r.game_end_method, r.lras_initiator);
 
-  for (auto i = 0; i < 2; ++i)
+  auto mm_players = recentMmResult.players;
+
+  for (auto i = 0; i < 4; ++i)
   {
     SlippiGameReporter::PlayerReport p;
-    auto offset = i * 6;
-    p.stocks_remaining = payload[5 + offset];
+    p.uid = mm_players.size() > i ? mm_players[i].uid : "";
+    p.slot_type = query.players[i].slot_type;
+    p.stocks_remaining = query.players[i].stocks_remaining;
+    p.damage_done = query.players[i].damage_done;
+    p.char_id = query.game_info_block[0x60 + 0x24 * i];
+    p.color_id = query.game_info_block[0x63 + 0x24 * i];
+    p.starting_stocks = query.game_info_block[0x62 + 0x24 * i];
+    p.starting_percent = Common::FromBigEndian(*(u16*)&query.game_info_block[0x70 + 0x24 * i]);
 
-    auto swappedDamageDone = Common::swap32(&payload[6 + offset]);
-    p.damage_done = *(float*)&swappedDamageDone;
-
-    // ERROR_LOG_FMT(SLIPPI_ONLINE, "Stocks: {}, DamageDone: %f", p.stocks_remaining,
-    // p.damage_done);
+    ERROR_LOG_FMT(SLIPPI_ONLINE,
+                  "UID: {}, Port Type: {}, Stocks: {}, DamageDone: {}, CharId: {}, ColorId: {}, "
+                  "StartStocks: {}, "
+                  "StartPercent: {}",
+                  p.uid, p.slot_type, p.stocks_remaining, p.damage_done, p.char_id, p.color_id,
+                  p.starting_stocks, p.starting_percent);
 
     r.players.push_back(p);
   }
 
+#ifndef LOCAL_TESTING
   game_reporter->StartReport(r);
 #endif
 }
@@ -3063,6 +3189,84 @@ void CEXISlippi::prepareDelayResponse()
   m_read_queue.push_back(Config::Get(Config::SLIPPI_ONLINE_DELAY));
 }
 
+void CEXISlippi::handleOverwriteSelections(const SlippiExiTypes::OverwriteSelectionsQuery& query)
+{
+  overwrite_selections.clear();
+
+  for (int i = 0; i < 4; i++)
+  {
+    // TODO: I'm pretty sure this contine would cause bugs if we tried to overwrite only player 1
+    // TODO: and not player 0. Right now though GamePrep always overwrites both p0 and p1 so it's
+    // fine
+    // TODO: The bug would likely happen in the prepareOnlineMatchState, it would overwrite the
+    // TODO: wrong players I think
+    if (!query.chars[i].is_set)
+      continue;
+
+    SlippiPlayerSelections s;
+    s.isCharacterSelected = true;
+    s.characterId = query.chars[i].char_id;
+    s.characterColor = query.chars[i].char_color_id;
+    s.isStageSelected = true;
+    s.stageId = query.stage_id;
+    s.playerIdx = i;
+
+    overwrite_selections.push_back(s);
+  }
+}
+
+void CEXISlippi::handleGamePrepStepComplete(const SlippiExiTypes::GpCompleteStepQuery& query)
+{
+  if (!slippi_netplay)
+    return;
+
+  SlippiGamePrepStepResults res;
+  res.step_idx = query.step_idx;
+  res.char_selection = query.char_selection;
+  res.char_color_selection = query.char_color_selection;
+  memcpy(res.stage_selections, query.stage_selections, 2);
+
+  slippi_netplay->SendGamePrepStep(res);
+}
+
+void CEXISlippi::prepareGamePrepOppStep(const SlippiExiTypes::GpFetchStepQuery& query)
+{
+  SlippiExiTypes::GpFetchStepResponse resp;
+
+  m_read_queue.clear();
+
+  // Start by indicating not found
+  resp.is_found = false;
+
+#ifdef LOCAL_TESTING
+  static int delay_count = 0;
+
+  delay_count++;
+  if (delay_count >= 90)
+  {
+    resp.is_found = true;
+    resp.is_skip = true;  // Will make client just pick the next available options
+
+    delay_count = 0;
+  }
+#else
+  SlippiGamePrepStepResults res;
+  if (slippi_netplay && slippi_netplay->GetGamePrepResults(query.step_idx, res))
+  {
+    // If we have received a response from the opponent, prepare the values for response
+    resp.is_found = true;
+    resp.is_skip = false;
+    resp.char_selection = res.char_selection;
+    resp.char_color_selection = res.char_color_selection;
+    memcpy(resp.stage_selections, res.stage_selections, 2);
+  }
+#endif
+
+  auto data_ptr = (u8*)&resp;
+  m_read_queue.insert(m_read_queue.end(), data_ptr,
+                      data_ptr + sizeof(SlippiExiTypes::GpFetchStepResponse));
+}
+
 void CEXISlippi::DMAWrite(u32 _uAddr, u32 _uSize)
 {
   auto& system = Core::System::GetInstance();
@@ -3106,13 +3310,16 @@ void CEXISlippi::DMAWrite(u32 _uAddr, u32 _uSize)
                memPtr[bufLoc], memPtr[bufLoc + 1], memPtr[bufLoc + 2], memPtr[bufLoc + 3],
                memPtr[bufLoc + 4]);
 
+  u8 prevCommandByte = 0;
+
   while (bufLoc < _uSize)
   {
     byte = memPtr[bufLoc];
     if (!payloadSizes.count(byte))
     {
       // This should never happen. Do something else if it does?
-      WARN_LOG_FMT(EXPANSIONINTERFACE, "EXI SLIPPI: Invalid command byte: {:#x}", byte);
+      ERROR_LOG_FMT(SLIPPI, "EXI SLIPPI: Invalid command byte: {:#x}. Prev command: {:#x}", byte,
+                    prevCommandByte);
       return;
     }
 
@@ -3204,7 +3411,7 @@ void CEXISlippi::DMAWrite(u32 _uAddr, u32 _uSize)
       prepareNewSeed();
       break;
     case CMD_REPORT_GAME:
-      handleReportGame(&memPtr[bufLoc + 1]);
+      handleReportGame(SlippiExiTypes::Convert<SlippiExiTypes::ReportGameQuery>(&memPtr[bufLoc]));
       break;
     case CMD_GCT_LENGTH:
       prepareGctLength();
@@ -3215,12 +3422,25 @@ void CEXISlippi::DMAWrite(u32 _uAddr, u32 _uSize)
     case CMD_GET_DELAY:
       prepareDelayResponse();
       break;
+    case CMD_OVERWRITE_SELECTIONS:
+      handleOverwriteSelections(
+          SlippiExiTypes::Convert<SlippiExiTypes::OverwriteSelectionsQuery>(&memPtr[bufLoc]));
+      break;
+    case CMD_GP_FETCH_STEP:
+      prepareGamePrepOppStep(
+          SlippiExiTypes::Convert<SlippiExiTypes::GpFetchStepQuery>(&memPtr[bufLoc]));
+      break;
+    case CMD_GP_COMPLETE_STEP:
+      handleGamePrepStepComplete(
+          SlippiExiTypes::Convert<SlippiExiTypes::GpCompleteStepQuery>(&memPtr[bufLoc]));
+      break;
     default:
       writeToFileAsync(&memPtr[bufLoc], payloadLen + 1, "");
       SlippiSpectateServer::getInstance().write(&memPtr[bufLoc], payloadLen + 1);
       break;
     }
 
+    prevCommandByte = byte;
     bufLoc += payloadLen + 1;
   }
 }
diff --git a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h
index 69d58de3dd..df3cf697c9 100644
--- a/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h
+++ b/Source/Core/Core/HW/EXI/EXI_DeviceSlippi.h
@@ -8,6 +8,7 @@
 #include "Common/FileUtil.h"
 #include "Common/IOFile.h"
 #include "Core/Slippi/SlippiDirectCodes.h"
+#include "Core/Slippi/SlippiExiTypes.h"
 #include "Core/Slippi/SlippiGame.h"
 #include "Core/Slippi/SlippiGameFileLoader.h"
 #include "Core/Slippi/SlippiGameReporter.h"
@@ -75,6 +76,9 @@ private:
     CMD_GET_NEW_SEED = 0xBC,
     CMD_REPORT_GAME = 0xBD,
     CMD_FETCH_CODE_SUGGESTION = 0xBE,
+    CMD_OVERWRITE_SELECTIONS = 0xBF,
+    CMD_GP_COMPLETE_STEP = 0xC0,
+    CMD_GP_FETCH_STEP = 0xC1,
 
     // Misc
     CMD_LOG_MESSAGE = 0xD0,
@@ -102,8 +106,8 @@ private:
       {CMD_RECEIVE_COMMANDS, 1},
 
       // The following are all commands used to play back a replay and
-      // have fixed sizes
-      {CMD_PREPARE_REPLAY, 0},
+      // have fixed sizes unless otherwise specified
+      {CMD_PREPARE_REPLAY, 0xFFFF},  // Variable size... will only work if by itself
       {CMD_READ_FRAME, 4},
       {CMD_IS_STOCK_STEAL, 5},
       {CMD_GET_LOCATION, 6},
@@ -111,7 +115,7 @@ private:
       {CMD_GET_GECKO_CODES, 0},
 
       // The following are used for Slippi online and also have fixed sizes
-      {CMD_ONLINE_INPUTS, 21},
+      {CMD_ONLINE_INPUTS, 25},
       {CMD_CAPTURE_SAVESTATE, 32},
       {CMD_LOAD_SAVESTATE, 32},
       {CMD_GET_MATCH_STATE, 0},
@@ -124,8 +128,12 @@ private:
       {CMD_GET_ONLINE_STATUS, 0},
       {CMD_CLEANUP_CONNECTION, 0},
       {CMD_GET_NEW_SEED, 0},
-      {CMD_REPORT_GAME, 16},
+      {CMD_REPORT_GAME, static_cast<u32>(sizeof(SlippiExiTypes::ReportGameQuery) - 1)},
       {CMD_FETCH_CODE_SUGGESTION, 31},
+      {CMD_OVERWRITE_SELECTIONS,
+       static_cast<u32>(sizeof(SlippiExiTypes::OverwriteSelectionsQuery) - 1)},
+      {CMD_GP_COMPLETE_STEP, static_cast<u32>(sizeof(SlippiExiTypes::GpCompleteStepQuery) - 1)},
+      {CMD_GP_FETCH_STEP, static_cast<u32>(sizeof(SlippiExiTypes::GpFetchStepQuery) - 1)},
 
       // Misc
       {CMD_LOG_MESSAGE, 0xFFFF},  // Variable size... will only work if by itself
@@ -173,7 +181,7 @@ private:
   bool isDisconnected();
   void handleOnlineInputs(u8* payload);
   void prepareOpponentInputs(s32 frame, bool shouldSkip);
-  void handleSendInputs(u8* payload);
+  void handleSendInputs(s32 frame, u8 delay, s32 checksum_frame, u32 checksum, u8* inputs);
   void handleCaptureSavestate(u8* payload);
   void handleLoadSavestate(u8* payload);
   void handleNameEntryLoad(u8* payload);
@@ -187,7 +195,10 @@ private:
   void prepareOnlineStatus();
   void handleConnectionCleanup();
   void prepareNewSeed();
-  void handleReportGame(u8* payload);
+  void handleReportGame(const SlippiExiTypes::ReportGameQuery& query);
+  void handleOverwriteSelections(const SlippiExiTypes::OverwriteSelectionsQuery& query);
+  void handleGamePrepStepComplete(const SlippiExiTypes::GpCompleteStepQuery& query);
+  void prepareGamePrepOppStep(const SlippiExiTypes::GpFetchStepQuery& query);
 
   // replay playback stuff
   void prepareGameInfo(u8* payload);
@@ -231,9 +242,13 @@ private:
   std::unique_ptr<Slippi::SlippiGame> m_current_game = nullptr;
   SlippiSpectateServer* m_slippiserver = nullptr;
   SlippiMatchmaking::MatchSearchSettings lastSearch;
+  SlippiMatchmaking::MatchmakeResult recentMmResult;
 
   std::vector<u16> stagePool;
 
+  // Used by ranked to set game prep selections
+  std::vector<SlippiPlayerSelections> overwrite_selections;
+
   u32 frameSeqIdx = 0;
 
   bool isEnetInitialized = false;
diff --git a/Source/Core/Core/HW/VideoInterface.cpp b/Source/Core/Core/HW/VideoInterface.cpp
index b2e0694bf0..d6890469a3 100644
--- a/Source/Core/Core/HW/VideoInterface.cpp
+++ b/Source/Core/Core/HW/VideoInterface.cpp
@@ -849,7 +849,7 @@ void VideoInterfaceManager::Update(u64 ticks)
   // Try calling SI Poll every time update is called
   SerialInterface::UpdateDevices();
   Core::UpdateInputGate(!Config::Get(Config::MAIN_INPUT_BACKGROUND_INPUT),
-                          Config::Get(Config::MAIN_LOCK_CURSOR));
+                        Config::Get(Config::MAIN_LOCK_CURSOR));
 
   // Movie's frame counter should be updated before actually rendering the frame,
   // in case frame counter display is enabled
@@ -884,7 +884,8 @@ void VideoInterfaceManager::Update(u64 ticks)
   if (m_half_line_count == 0 || m_half_line_count == GetHalfLinesPerEvenField())
     Core::Callback_NewField(m_system);
 
-  // SLIPPINOTES: this section is disable because we would rather poll every chance we get to reduce lag
+  // SLIPPINOTES: this section is disable because we would rather poll every chance we get to reduce
+  // lag
   // // If an SI poll is scheduled to happen on this half-line, do it!
 
   // if (m_half_line_of_next_si_poll == m_half_line_count)
diff --git a/Source/Core/Core/NetPlayProto.h b/Source/Core/Core/NetPlayProto.h
index 669cba0d2e..07ad5b95f2 100644
--- a/Source/Core/Core/NetPlayProto.h
+++ b/Source/Core/Core/NetPlayProto.h
@@ -157,6 +157,7 @@ enum class MessageID : u8
   SLIPPI_MATCH_SELECTIONS = 0x82,
   SLIPPI_CONN_SELECTED = 0x83,
   SLIPPI_CHAT_MESSAGE = 0x84,
+  SLIPPI_COMPLETE_STEP = 0x85,
 
   GolfRequest = 0x90,
   GolfSwitch = 0x91,
diff --git a/Source/Core/Core/Slippi/SlippiExiTypes.h b/Source/Core/Core/Slippi/SlippiExiTypes.h
new file mode 100644
index 0000000000..613383ee15
--- /dev/null
+++ b/Source/Core/Core/Slippi/SlippiExiTypes.h
@@ -0,0 +1,107 @@
+#pragma once
+
+#include "Common/CommonTypes.h"
+
+#define REPORT_PLAYER_COUNT 4
+
+namespace SlippiExiTypes
+{
+// Using pragma pack here will remove any structure padding which is what EXI comms expect
+// https://www.geeksforgeeks.org/how-to-avoid-structure-padding-in-c/
+// Note that none of these classes should be used outside of the handler function, pragma pack
+// is supposedly not very efficient?
+#pragma pack(1)
+
+struct ReportGameQueryPlayer
+{
+  u8 slot_type;
+  u8 stocks_remaining;
+  float damage_done;
+};
+
+struct ReportGameQuery
+{
+  u8 command;
+  u8 mode;
+  u32 frame_length;
+  u32 game_index;
+  u32 tiebreak_index;
+  s8 winner_idx;
+  u8 game_end_method;
+  s8 lras_initiator;
+  ReportGameQueryPlayer players[REPORT_PLAYER_COUNT];
+  u8 game_info_block[312];
+};
+
+struct GpCompleteStepQuery
+{
+  u8 command;
+  u8 step_idx;
+  u8 char_selection;
+  u8 char_color_selection;
+  u8 stage_selections[2];
+};
+
+struct GpFetchStepQuery
+{
+  u8 command;
+  u8 step_idx;
+};
+
+struct GpFetchStepResponse
+{
+  u8 is_found;
+  u8 is_skip;
+  u8 char_selection;
+  u8 char_color_selection;
+  u8 stage_selections[2];
+};
+
+struct OverwriteCharSelections
+{
+  u8 is_set;
+  u8 char_id;
+  u8 char_color_id;
+};
+struct OverwriteSelectionsQuery
+{
+  u8 command;
+  u16 stage_id;
+  OverwriteCharSelections chars[4];
+};
+
+// Not sure if resetting is strictly needed, might be contained to the file
+#pragma pack()
+
+template <typename T>
+inline T Convert(u8* payload)
+{
+  return *reinterpret_cast<T*>(payload);
+}
+
+// Here we define custom convert functions for any type that larger than u8 sized fields to convert
+// from big-endian
+
+template <>
+inline ReportGameQuery Convert(u8* payload)
+{
+  auto q = *reinterpret_cast<ReportGameQuery*>(payload);
+  q.frameLength = Common::FromBigEndian(q.frameLength);
+  q.gameIndex = Common::FromBigEndian(q.gameIndex);
+  q.tiebreakIndex = Common::FromBigEndian(q.tiebreakIndex);
+  for (int i = 0; i < REPORT_PLAYER_COUNT; i++)
+  {
+    auto* p = &q.players[i];
+    p->damageDone = Common::FromBigEndian(p->damageDone);
+  }
+  return q;
+}
+
+template <>
+inline OverwriteSelectionsQuery Convert(u8* payload)
+{
+  auto q = *reinterpret_cast<OverwriteSelectionsQuery*>(payload);
+  q.stage_id = Common::FromBigEndian(q.stage_id);
+  return q;
+}
+};  // namespace SlippiExiTypes
diff --git a/Source/Core/Core/Slippi/SlippiGameReporter.cpp b/Source/Core/Core/Slippi/SlippiGameReporter.cpp
index 883d404064..6b2eeda410 100644
--- a/Source/Core/Core/Slippi/SlippiGameReporter.cpp
+++ b/Source/Core/Core/Slippi/SlippiGameReporter.cpp
@@ -9,6 +9,7 @@
 
 #include "Common/Common.h"
 #include "Core/ConfigManager.h"
+#include "Core/Slippi/SlippiMatchmaking.h"
 
 #include <codecvt>
 #include <locale>
@@ -39,15 +40,15 @@ SlippiGameReporter::SlippiGameReporter(SlippiUser* user)
   m_user = user;
 
   run_thread = true;
-  reportingThread = std::thread(&SlippiGameReporter::ReportThreadHandler, this);
+  reporting_thread = std::thread(&SlippiGameReporter::ReportThreadHandler, this);
 }
 
 SlippiGameReporter::~SlippiGameReporter()
 {
   run_thread = false;
   cv.notify_one();
-  if (reportingThread.joinable())
-    reportingThread.join();
+  if (reporting_thread.joinable())
+    reporting_thread.join();
 
   if (m_curl)
   {
@@ -62,10 +63,9 @@ void SlippiGameReporter::StartReport(GameReport report)
   cv.notify_one();
 }
 
-void SlippiGameReporter::StartNewSession(std::vector<std::string> new_player_uids)
+void SlippiGameReporter::StartNewSession()
 {
-  this->m_player_uids = new_player_uids;
-  gameIndex = 1;
+  game_index = 1;
 }
 
 void SlippiGameReporter::ReportThreadHandler()
@@ -83,22 +83,45 @@ void SlippiGameReporter::ReportThreadHandler()
       auto report = game_report_queue.front();
       game_report_queue.pop();
 
-      auto userInfo = m_user->GetUserInfo();
+      auto ranked = SlippiMatchmaking::OnlinePlayMode::RANKED;
+      auto unranked = SlippiMatchmaking::OnlinePlayMode::UNRANKED;
+      bool should_report = report.mode == ranked || report.mode == unranked;
+      if (!should_report)
+      {
+        break;
+      }
+
+      auto user_info = m_user->GetUserInfo();
+      WARN_LOG_FMT(SLIPPI_ONLINE, "Checking game report for game {}. Length: {}...", game_index,
+                   report.duration_frames);
 
       // Prepare report
       json request;
-      request["uid"] = userInfo.uid;
-      request["playKey"] = userInfo.play_key;
-      request["gameIndex"] = gameIndex;
+      request["matchId"] = report.match_id;
+      request["uid"] = user_info.uid;
+      request["playKey"] = user_info.play_key;
+      request["mode"] = report.mode;
+      request["gameIndex"] = report.mode == ranked ? report.game_index : game_index;
+      request["tiebreakIndex"] = report.mode == ranked ? report.tiebreak_index : 0;
+      request["gameIndex"] = game_index;
       request["gameDurationFrames"] = report.duration_frames;
+      request["winnerIdx"] = report.winner_idx;
+      request["gameEndMethod"] = report.game_end_method;
+      request["lrasInitiator"] = report.lras_initiator;
+      request["stageId"] = report.stage_id;
 
       json players = json::array();
       for (int i = 0; i < report.players.size(); i++)
       {
         json p;
         p["uid"] = m_player_uids[i];
-        p["damage_done"] = report.players[i].damage_done;
-        p["stocks_remaining"] = report.players[i].stocks_remaining;
+        p["slotType"] = report.players[i].slot_type;
+        p["damageDone"] = report.players[i].damage_done;
+        p["stocksRemaining"] = report.players[i].stocks_remaining;
+        p["characterId"] = report.players[i].char_id;
+        p["colorId"] = report.players[i].color_id;
+        p["startingStocks"] = report.players[i].starting_stocks;
+        p["startingPercent"] = report.players[i].starting_percent;
 
         players[i] = p;
       }
@@ -120,8 +143,34 @@ void SlippiGameReporter::ReportThreadHandler()
                       static_cast<u8>(res));
       }
 
-      gameIndex++;
+      game_index++;
       Common::SleepCurrentThread(0);
     }
   }
 }
+
+void SlippiGameReporter::ReportAbandonment(std::string match_id)
+{
+  auto userInfo = m_user->GetUserInfo();
+
+  // Prepare report
+  json request;
+  request["matchId"] = match_id;
+  request["uid"] = userInfo.uid;
+  request["playKey"] = userInfo.play_key;
+
+  auto requestString = request.dump();
+
+  // Send report
+  curl_easy_setopt(m_curl, CURLOPT_POST, true);
+  curl_easy_setopt(m_curl, CURLOPT_URL, ABANDON_URL.c_str());
+  curl_easy_setopt(m_curl, CURLOPT_POSTFIELDS, requestString.c_str());
+  curl_easy_setopt(m_curl, CURLOPT_POSTFIELDSIZE, requestString.length());
+  CURLcode res = curl_easy_perform(m_curl);
+
+  if (res != 0)
+  {
+    ERROR_LOG_FMT(SLIPPI_ONLINE,
+                  "[GameReport] Got error executing abandonment request. Err code: {}", res);
+  }
+}
diff --git a/Source/Core/Core/Slippi/SlippiGameReporter.h b/Source/Core/Core/Slippi/SlippiGameReporter.h
index ea68933e23..ca542d51cc 100644
--- a/Source/Core/Core/Slippi/SlippiGameReporter.h
+++ b/Source/Core/Core/Slippi/SlippiGameReporter.h
@@ -9,6 +9,7 @@
 #include <thread>
 #include <vector>
 #include "Common/CommonTypes.h"
+#include "Core/Slippi/SlippiMatchmaking.h"
 #include "Core/Slippi/SlippiUser.h"
 
 class SlippiGameReporter
@@ -16,12 +17,27 @@ class SlippiGameReporter
 public:
   struct PlayerReport
   {
+    std::string uid;
+    u8 slot_type;
     float damage_done;
     u8 stocks_remaining;
+    u8 char_id;
+    u8 color_id;
+    int starting_stocks;
+    int starting_percent;
   };
+
   struct GameReport
   {
+    SlippiMatchmaking::OnlinePlayMode mode = SlippiMatchmaking::OnlinePlayMode::UNRANKED;
+    std::string match_id;
     u32 duration_frames = 0;
+    u32 game_index = 0;
+    u32 tiebreak_index = 0;
+    s8 winner_idx = 0;
+    u8 game_end_method = 0;
+    s8 lras_initiator = 0;
+    int stage_id;
     std::vector<PlayerReport> players;
   };
 
@@ -29,20 +45,22 @@ public:
   ~SlippiGameReporter();
 
   void StartReport(GameReport report);
-  void StartNewSession(std::vector<std::string> player_uids);
+  void ReportAbandonment(std::string match_id);
+  void StartNewSession();
   void ReportThreadHandler();
 
 protected:
   const std::string REPORT_URL = "https://rankings-dot-slippi.uc.r.appspot.com/report";
+  const std::string ABANDON_URL = "https://rankings-dot-slippi.uc.r.appspot.com/abandon";
   CURL* m_curl = nullptr;
   struct curl_slist* m_curl_header_list = nullptr;
 
-  u32 gameIndex = 1;
+  u32 game_index = 1;
   std::vector<std::string> m_player_uids;
 
   SlippiUser* m_user;
   std::queue<GameReport> game_report_queue;
-  std::thread reportingThread;
+  std::thread reporting_thread;
   std::mutex mtx;
   std::condition_variable cv;
   std::atomic<bool> run_thread;
diff --git a/Source/Core/Core/Slippi/SlippiMatchmaking.cpp b/Source/Core/Core/Slippi/SlippiMatchmaking.cpp
index fbcfeaedc4..f83b18d403 100644
--- a/Source/Core/Core/Slippi/SlippiMatchmaking.cpp
+++ b/Source/Core/Core/Slippi/SlippiMatchmaking.cpp
@@ -44,6 +44,7 @@ SlippiMatchmaking::SlippiMatchmaking(SlippiUser* user)
 
 SlippiMatchmaking::~SlippiMatchmaking()
 {
+  is_mm_terminated = true;
   m_state = ProcessState::ERROR_ENCOUNTERED;
   m_errorMsg = "Matchmaking shut down";
 
@@ -148,6 +149,11 @@ void SlippiMatchmaking::MatchmakeThread()
 {
   while (IsSearching())
   {
+    if (is_mm_terminated)
+    {
+      break;
+    }
+
     switch (m_state)
     {
     case ProcessState::INITIALIZING:
@@ -380,7 +386,10 @@ void SlippiMatchmaking::startMatchmaking()
   // Send message to server to create ticket
   json request;
   request["type"] = MmMessageType::CREATE_TICKET;
-  request["user"] = {{"uid", userInfo.uid}, {"playKey", userInfo.play_key}};
+  request["user"] = {{"uid", userInfo.uid},
+                     {"playKey", userInfo.play_key},
+                     {"connectCode", userInfo.connect_code},
+                     {"displayName", userInfo.display_name}};
   request["search"] = {{"mode", m_searchSettings.mode}, {"connectCode", connectCodeBuf}};
   request["appVersion"] = Common::GetSemVerStr();
   request["ipAddressLan"] = lan_addr;
@@ -477,6 +486,12 @@ void SlippiMatchmaking::handleMatchmaking()
   m_remoteIps.clear();
   m_playerInfo.clear();
 
+  std::string matchId = getResp.value("matchId", "");
+  WARN_LOG_FMT(SLIPPI_ONLINE, "Match ID: {}", matchId);
+
+  std::string match_id = getResp.value("matchId", "");
+  WARN_LOG_FMT(SLIPPI_ONLINE, "Match ID: {}", match_id);
+
   auto queue = getResp["players"];
   if (queue.is_array())
   {
@@ -564,6 +579,10 @@ void SlippiMatchmaking::handleMatchmaking()
     }
   }
 
+  m_mm_result.id = match_id;
+  m_mm_result.players = m_playerInfo;
+  m_mm_result.stages = m_allowedStages;
+
   // Disconnect and destroy enet client to mm server
   terminateMmConnection();
 
@@ -596,6 +615,11 @@ std::string SlippiMatchmaking::GetPlayerName(u8 port)
   return m_playerInfo[port].display_name;
 }
 
+SlippiMatchmaking::MatchmakeResult SlippiMatchmaking::GetMatchmakeResult()
+{
+  return m_mm_result;
+}
+
 u8 SlippiMatchmaking::RemotePlayerCount()
 {
   if (m_playerInfo.size() == 0)
diff --git a/Source/Core/Core/Slippi/SlippiMatchmaking.h b/Source/Core/Core/Slippi/SlippiMatchmaking.h
index 9e225f7c1a..3d07457575 100644
--- a/Source/Core/Core/Slippi/SlippiMatchmaking.h
+++ b/Source/Core/Core/Slippi/SlippiMatchmaking.h
@@ -47,6 +47,13 @@ public:
     std::string connectCode = "";
   };
 
+  struct MatchmakeResult
+  {
+    std::string id = "";
+    std::vector<SlippiUser::UserInfo> players;
+    std::vector<u16> stages;
+  };
+
   void FindMatch(MatchSearchSettings settings);
   void MatchmakeThread();
   ProcessState GetMatchmakeState();
@@ -58,6 +65,7 @@ public:
   std::string GetPlayerName(u8 port);
   std::vector<u16> GetStages();
   u8 RemotePlayerCount();
+  MatchmakeResult GetMatchmakeResult();
   static bool IsFixedRulesMode(OnlinePlayMode mode);
 
 protected:
@@ -73,6 +81,7 @@ protected:
   std::default_random_engine generator;
 
   bool isMmConnected = false;
+  bool is_mm_terminated = false;
 
   std::thread m_matchmakeThread;
 
@@ -88,6 +97,7 @@ protected:
   int m_hostPort;
   int m_localPlayerIndex;
   std::vector<std::string> m_remoteIps;
+  MatchmakeResult m_mm_result;
   std::vector<SlippiUser::UserInfo> m_playerInfo;
   std::vector<u16> m_allowedStages;
   bool m_joinedLobby;
diff --git a/Source/Core/Core/Slippi/SlippiNetplay.cpp b/Source/Core/Core/Slippi/SlippiNetplay.cpp
index be069f0a2d..50164877a1 100644
--- a/Source/Core/Core/Slippi/SlippiNetplay.cpp
+++ b/Source/Core/Core/Slippi/SlippiNetplay.cpp
@@ -188,7 +188,10 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet, ENetPeer* peer)
     // Fetch current time immediately for the most accurate timing calculations
     u64 curTime = Common::Timer::NowUs();
 
-    int32_t frame;
+    s32 frame;
+    s32 checksum_frame;
+    u32 checksum;
+
     if (!(packet >> frame))
     {
       ERROR_LOG_FMT(SLIPPI_ONLINE, "Netplay packet too small to read frame count");
@@ -201,6 +204,16 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet, ENetPeer* peer)
       ERROR_LOG_FMT(SLIPPI_ONLINE, "Netplay packet too small to read player index");
       break;
     }
+    if (!(packet >> checksum_frame))
+    {
+      ERROR_LOG_FMT(SLIPPI_ONLINE, "Netplay packet too small to read checksum frame");
+      break;
+    }
+    if (!(packet >> checksum))
+    {
+      ERROR_LOG_FMT(SLIPPI_ONLINE, "Netplay packet too small to read checksum value");
+      break;
+    }
     u8 pIdx = PlayerIdxFromPort(packetPlayerPort);
     if (pIdx >= m_remotePlayerCount)
     {
@@ -208,6 +221,9 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet, ENetPeer* peer)
       break;
     }
 
+    // This is the amount of bytes from the start of the packet where the pad data starts
+    int pad_data_offset = 14;
+
     // This fetches the m_server index that stores the connection we want to overwrite (if
     // necessary). Note that this index is not necessarily the same as the pIdx because if we have
     // users connecting with the same WAN, the m_server indices might not match
@@ -277,6 +293,7 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet, ENetPeer* peer)
 
     frameOffsetData[pIdx].idx = (frameOffsetData[pIdx].idx + 1) % SLIPPI_ONLINE_LOCKSTEP_INTERVAL;
 
+    s64 inputs_to_copy;
     {
       std::lock_guard<std::mutex> lk(pad_mutex);  // TODO: Is this the correct lock?
 
@@ -289,45 +306,56 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet, ENetPeer* peer)
 
       s64 frame64 = static_cast<s64>(frame);
       s32 headFrame = remotePadQueue[pIdx].empty() ? 0 : remotePadQueue[pIdx].front()->frame;
-      s64 inputsToCopy = frame64 - static_cast<s64>(headFrame);
+      s64 inputs_to_copy = frame64 - static_cast<s64>(headFrame);
 
       // Check that the packet actually contains the data it claims to
-      if ((6 + inputsToCopy * SLIPPI_PAD_DATA_SIZE) > static_cast<s64>(packet.getDataSize()))
+      if ((pad_data_offset + inputs_to_copy * SLIPPI_PAD_DATA_SIZE) >
+          static_cast<s64>(packet.getDataSize()))
       {
         ERROR_LOG_FMT(
             SLIPPI_ONLINE,
             "Netplay packet too small to read pad buffer. Size: {}, Inputs: {}, MinSize: {}",
-            static_cast<int>(packet.getDataSize()), inputsToCopy,
-            6 + inputsToCopy * SLIPPI_PAD_DATA_SIZE);
+            static_cast<int>(packet.getDataSize()), inputs_to_copy,
+            pad_data_offset + inputs_to_copy * SLIPPI_PAD_DATA_SIZE);
         break;
       }
 
       // Not sure what the max is here. If we never ack frames it could get big...
-      if (inputsToCopy > 128)
+      if (inputs_to_copy > 128)
       {
-        ERROR_LOG_FMT(SLIPPI_ONLINE, "Netplay packet contained too many frames: {}", inputsToCopy);
+        ERROR_LOG_FMT(SLIPPI_ONLINE, "Netplay packet contained too many frames: {}",
+                      inputs_to_copy);
         break;
       }
 
-      for (s64 i = inputsToCopy - 1; i >= 0; i--)
+      for (s64 i = inputs_to_copy - 1; i >= 0; i--)
       {
-        auto pad = std::make_unique<SlippiPad>(static_cast<s32>(frame64 - i), pIdx,
-                                               &packetData[6 + i * SLIPPI_PAD_DATA_SIZE]);
+        auto pad =
+            std::make_unique<SlippiPad>(static_cast<s32>(frame64 - i), pIdx,
+                                        &packetData[pad_data_offset + i * SLIPPI_PAD_DATA_SIZE]);
         remotePadQueue[pIdx].push_front(std::move(pad));
       }
     }
 
-    // Send Ack
-    sf::Packet spac;
-    spac << static_cast<u8>(NetPlay::MessageID::SLIPPI_PAD_ACK);
-    spac << frame;
-    spac << m_player_idx;
-    // INFO_LOG_FMT(SLIPPI_ONLINE, "Sending ack packet for frame {} (player {}) to peer at {}:{}",
-    //              frame, packetPlayerPort, peer->address.host, peer->address.port);
+    // Only ack if inputsToCopy is greater than 0. Otherwise we are receiving an old input and
+    // we should have already acked something in the future. This can also happen in the case
+    // where a new game starts quickly before the remote queue is reset and if we ack the early
+    // inputs we will never receive them
+    if (inputs_to_copy > 0)
+    {
+      // Send Ack
+      sf::Packet spac;
+      spac << static_cast<u8>(NetPlay::MessageID::SLIPPI_PAD_ACK);
+      spac << frame;
+      spac << m_player_idx;
+      // INFO_LOG(SLIPPI_ONLINE, "Sending ack packet for frame %d (player %d) to peer at %d:%d",
+      // frame, packetPlayerPort,
+      //         peer->address.host, peer->address.port);
 
-    ENetPacket* epac =
-        enet_packet_create(spac.getData(), spac.getDataSize(), ENET_PACKET_FLAG_UNSEQUENCED);
-    enet_peer_send(peer, 2, epac);
+      ENetPacket* epac =
+          enet_packet_create(spac.getData(), spac.getDataSize(), ENET_PACKET_FLAG_UNSEQUENCED);
+      int sendResult = enet_peer_send(peer, 2, epac);
+    }
   }
   break;
 
@@ -440,6 +468,20 @@ unsigned int SlippiNetplayClient::OnData(sf::Packet& packet, ENetPeer* peer)
   }
   break;
 
+  case NetPlay::MessageID::SLIPPI_COMPLETE_STEP:
+  {
+    SlippiGamePrepStepResults results;
+
+    packet >> results.step_idx;
+    packet >> results.char_selection;
+    packet >> results.char_color_selection;
+    packet >> results.stage_selections[0];
+    packet >> results.stage_selections[1];
+
+    game_prep_step_queue.push_back(results);
+  }
+  break;
+
   default:
     WARN_LOG_FMT(SLIPPI_ONLINE, "Unknown message received with id : {}", static_cast<u8>(mid));
     break;
@@ -989,6 +1031,9 @@ void SlippiNetplayClient::StartSlippiGame()
     std::swap(ackTimers[i], empty);
   }
 
+  // Clear game prep queue in case anything is still lingering
+  game_prep_step_queue.clear();
+
   // Reset match info for next game
   matchInfo.Reset();
 }
@@ -1046,9 +1091,11 @@ void SlippiNetplayClient::SendSlippiPad(std::unique_ptr<SlippiPad> pad)
   *spac << static_cast<u8>(NetPlay::MessageID::SLIPPI_PAD);
   *spac << frame;
   *spac << this->m_player_idx;
+  *spac << localPadQueue.front()->checksum_frame;
+  *spac << localPadQueue.front()->checksum;
 
   for (auto it = localPadQueue.begin(); it != localPadQueue.end(); ++it)
-    spac->append((*it)->padBuf, SLIPPI_PAD_DATA_SIZE);  // only transfer 8 bytes per pad
+    spac->append((*it)->pad_buf, SLIPPI_PAD_DATA_SIZE);  // only transfer 8 bytes per pad
 
   SendAsync(std::move(spac));
   u64 time = Common::Timer::NowUs();
@@ -1081,6 +1128,35 @@ void SlippiNetplayClient::SetMatchSelections(SlippiPlayerSelections& s)
   SendAsync(std::move(spac));
 }
 
+void SlippiNetplayClient::SendGamePrepStep(SlippiGamePrepStepResults& s)
+{
+  auto spac = std::make_unique<sf::Packet>();
+  *spac << static_cast<u8>(NetPlay::MessageID::SLIPPI_COMPLETE_STEP);
+  *spac << s.step_idx;
+  *spac << s.char_selection;
+  *spac << s.char_color_selection;
+  *spac << s.stage_selections[0] << s.stage_selections[1];
+  SendAsync(std::move(spac));
+}
+
+bool SlippiNetplayClient::GetGamePrepResults(u8 step_idx, SlippiGamePrepStepResults& res)
+{
+  // Just pull stuff off until we find something for the right step. I think that should be fine
+  while (!game_prep_step_queue.empty())
+  {
+    auto front = game_prep_step_queue.front();
+    if (front.step_idx == step_idx)
+    {
+      res = front;
+      return true;
+    }
+
+    game_prep_step_queue.pop_front();
+  }
+
+  return false;
+}
+
 SlippiPlayerSelections SlippiNetplayClient::GetSlippiRemoteChatMessage(bool isChatEnabled)
 {
   SlippiPlayerSelections copiedSelection = SlippiPlayerSelections();
@@ -1098,6 +1174,7 @@ SlippiPlayerSelections SlippiNetplayClient::GetSlippiRemoteChatMessage(bool isCh
   {
     copiedSelection.messageId = 0;
     copiedSelection.playerIdx = 0;
+
     // if chat is not enabled, automatically send back a message saying so.
     if (remoteChatMessageSelection != nullptr && !isChatEnabled &&
         (remoteChatMessageSelection->messageId > 0 &&
@@ -1137,12 +1214,12 @@ std::unique_ptr<SlippiRemotePadOutput> SlippiNetplayClient::GetFakePadOutput(int
   if (frame % 60 < 5)
   {
     // Return old inputs for a bit
-    padOutput->latestFrame = frame - (frame % 60);
+    padOutput->latest_frame = frame - (frame % 60);
     padOutput->data.insert(padOutput->data.begin(), SLIPPI_PAD_FULL_SIZE, 0);
   }
   else if (frame % 60 == 5)
   {
-    padOutput->latestFrame = frame;
+    padOutput->latest_frame = frame;
     // Add 5 frames of 0'd inputs
     padOutput->data.insert(padOutput->data.begin(), 5 * SLIPPI_PAD_FULL_SIZE, 0);
 
@@ -1151,7 +1228,7 @@ std::unique_ptr<SlippiRemotePadOutput> SlippiNetplayClient::GetFakePadOutput(int
   }
   else
   {
-    padOutput->latestFrame = frame;
+    padOutput->latest_frame = frame;
     padOutput->data.insert(padOutput->data.begin(), SLIPPI_PAD_FULL_SIZE, 0);
   }
 
@@ -1169,9 +1246,9 @@ std::unique_ptr<SlippiRemotePadOutput> SlippiNetplayClient::GetSlippiRemotePad(i
   {
     auto emptyPad = std::make_unique<SlippiPad>(0);
 
-    padOutput->latestFrame = emptyPad->frame;
+    padOutput->latest_frame = emptyPad->frame;
 
-    auto emptyIt = std::begin(emptyPad->padBuf);
+    auto emptyIt = std::begin(emptyPad->pad_buf);
     padOutput->data.insert(padOutput->data.end(), emptyIt, emptyIt + SLIPPI_PAD_FULL_SIZE);
 
     return std::move(padOutput);
@@ -1179,7 +1256,9 @@ std::unique_ptr<SlippiRemotePadOutput> SlippiNetplayClient::GetSlippiRemotePad(i
 
   int inputCount = 0;
 
-  padOutput->latestFrame = 0;
+  padOutput->latest_frame = 0;
+  padOutput->checksum_frame = remoteChecksum[index].frame;
+  padOutput->checksum = remoteChecksum[index].value;
 
   // Copy inputs from the remote pad queue to the output. We iterate backwards because
   // we want to get the oldest frames possible (will have been cleared to contain the last
@@ -1188,14 +1267,14 @@ std::unique_ptr<SlippiRemotePadOutput> SlippiNetplayClient::GetSlippiRemotePad(i
   // game actually needed.
   for (auto it = remotePadQueue[index].rbegin(); it != remotePadQueue[index].rend(); ++it)
   {
-    if ((*it)->frame > padOutput->latestFrame)
-      padOutput->latestFrame = (*it)->frame;
+    if ((*it)->frame > padOutput->latest_frame)
+      padOutput->latest_frame = (*it)->frame;
 
     // NOTICE_LOG(SLIPPI_ONLINE, "[%d] (Remote) P%d %08X %08X %08X", (*it)->frame,
     //						index >= playerIdx ? index + 1 : index, Common::swap32(&(*it)->padBuf[0]),
     //						Common::swap32(&(*it)->padBuf[4]), Common::swap32(&(*it)->padBuf[8]));
 
-    auto padIt = std::begin((*it)->padBuf);
+    auto padIt = std::begin((*it)->pad_buf);
     padOutput->data.insert(padOutput->data.begin(), padIt, padIt + SLIPPI_PAD_FULL_SIZE);
 
     // Limit max amount of inputs to send
@@ -1231,7 +1310,7 @@ int32_t SlippiNetplayClient::GetSlippiLatestRemoteFrame(int maxFrameCount)
   for (int i = 0; i < m_remotePlayerCount; i++)
   {
     auto rp = GetSlippiRemotePad(i, maxFrameCount);
-    int f = rp->latestFrame;
+    int f = rp->latest_frame;
     if (f < lowestFrame || !isFrameSet)
     {
       lowestFrame = f;
diff --git a/Source/Core/Core/Slippi/SlippiNetplay.h b/Source/Core/Core/Slippi/SlippiNetplay.h
index 852b1e6492..bd61527373 100644
--- a/Source/Core/Core/Slippi/SlippiNetplay.h
+++ b/Source/Core/Core/Slippi/SlippiNetplay.h
@@ -34,11 +34,21 @@
 
 struct SlippiRemotePadOutput
 {
-  int32_t latestFrame{};
+  int32_t latest_frame{};
+  s32 checksum_frame;
+  u32 checksum;
   u8 playerIdx{};
   std::vector<u8> data;
 };
 
+struct SlippiGamePrepStepResults
+{
+  u8 step_idx;
+  u8 char_selection;
+  u8 char_color_selection;
+  u8 stage_selections[2];
+};
+
 class SlippiPlayerSelections
 {
 public:
@@ -90,6 +100,12 @@ public:
   }
 };
 
+struct ChecksumEntry
+{
+  s32 frame;
+  u32 value;
+};
+
 class SlippiMatchInfo
 {
 public:
@@ -137,6 +153,8 @@ public:
   void SendConnectionSelected();
   void SendSlippiPad(std::unique_ptr<SlippiPad> pad);
   void SetMatchSelections(SlippiPlayerSelections& s);
+  void SendGamePrepStep(SlippiGamePrepStepResults& s);
+  bool GetGamePrepResults(u8 stepIdx, SlippiGamePrepStepResults& res);
   std::unique_ptr<SlippiRemotePadOutput> GetFakePadOutput(int frame);
   std::unique_ptr<SlippiRemotePadOutput> GetSlippiRemotePad(int index, int maxFrameCount);
   void DropOldRemoteInputs(int32_t finalizedFrame);
@@ -201,7 +219,8 @@ protected:
   std::deque<std::unique_ptr<SlippiPad>> localPadQueue;  // most recent inputs at start of deque
   std::deque<std::unique_ptr<SlippiPad>>
       remotePadQueue[SLIPPI_REMOTE_PLAYER_MAX];  // most recent inputs at start of deque
-
+  ChecksumEntry remoteChecksum[SLIPPI_REMOTE_PLAYER_MAX];
+  std::deque<SlippiGamePrepStepResults> game_prep_step_queue;
   u64 pingUs[SLIPPI_REMOTE_PLAYER_MAX];
   int32_t lastFrameAcked[SLIPPI_REMOTE_PLAYER_MAX];
   FrameOffsetData frameOffsetData[SLIPPI_REMOTE_PLAYER_MAX];
diff --git a/Source/Core/Core/Slippi/SlippiPad.cpp b/Source/Core/Core/Slippi/SlippiPad.cpp
index b06bc19795..3538cb8f67 100644
--- a/Source/Core/Core/Slippi/SlippiPad.cpp
+++ b/Source/Core/Core/Slippi/SlippiPad.cpp
@@ -10,21 +10,24 @@ static u8 emptyPad[SLIPPI_PAD_FULL_SIZE] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
 SlippiPad::SlippiPad(int32_t frame)
 {
   this->frame = frame;
-  memcpy(this->padBuf, emptyPad, SLIPPI_PAD_FULL_SIZE);
+  this->checksum = 0;
+  this->checksum_frame = 0;
+  memcpy(this->pad_buf, emptyPad, SLIPPI_PAD_FULL_SIZE);
 }
 
-SlippiPad::SlippiPad(int32_t frame, u8* padBuf) : SlippiPad(frame)
+SlippiPad::SlippiPad(int32_t frame, u8* pad_buf) : SlippiPad(frame)
 {
   // Overwrite the data portion of the pad
-  memcpy(this->padBuf, padBuf, SLIPPI_PAD_DATA_SIZE);
+  memcpy(this->pad_buf, pad_buf, SLIPPI_PAD_DATA_SIZE);
 }
 
-SlippiPad::SlippiPad(int32_t frame, u8 playerIdx, u8* padBuf) : SlippiPad(frame)
+SlippiPad::SlippiPad(int32_t frame, s32 checksum_frame, u32 checksum, u8* pad_buf)
+    : SlippiPad(frame, pad_buf)
 {
-  this->frame = frame;
-  this->playerIdx = playerIdx;
+  this->checksum_frame = checksum_frame;
+  this->checksum = checksum;
   // Overwrite the data portion of the pad
-  memcpy(this->padBuf, padBuf, SLIPPI_PAD_DATA_SIZE);
+  memcpy(this->pad_buf, pad_buf, SLIPPI_PAD_DATA_SIZE);
 }
 
 SlippiPad::~SlippiPad()
diff --git a/Source/Core/Core/Slippi/SlippiPad.h b/Source/Core/Core/Slippi/SlippiPad.h
index b8dfe31f35..deb3fe98d4 100644
--- a/Source/Core/Core/Slippi/SlippiPad.h
+++ b/Source/Core/Core/Slippi/SlippiPad.h
@@ -9,11 +9,12 @@ class SlippiPad
 {
 public:
   SlippiPad(int32_t frame);
-  SlippiPad(int32_t frame, u8* padBuf);
-  SlippiPad(int32_t frame, u8 playerIdx, u8* padBuf);
+  SlippiPad(int32_t frame, u8* pad_buf);
+  SlippiPad(int32_t frame, s32 checksum_frame, u32 checksum, u8* pad_buf);
   ~SlippiPad();
 
-  int32_t frame;
-  u8 playerIdx;
-  u8 padBuf[SLIPPI_PAD_FULL_SIZE];
+  s32 frame;
+  s32 checksum_frame;
+  u32 checksum;
+  u8 pad_buf[SLIPPI_PAD_FULL_SIZE];
 };
diff --git a/Source/Core/DolphinQt/RenderWidget.cpp b/Source/Core/DolphinQt/RenderWidget.cpp
index 3a9da28431..58be438da4 100644
--- a/Source/Core/DolphinQt/RenderWidget.cpp
+++ b/Source/Core/DolphinQt/RenderWidget.cpp
@@ -19,16 +19,16 @@
 #include <QTimer>
 #include <QWindow>
 
-//test ui stuff
-#include <QVBoxLayout>
+// test ui stuff
 #include <QPushButton>
+#include <QVBoxLayout>
 
 #include "imgui.h"
 
 #include "Core/Config/MainSettings.h"
 #include "Core/Core.h"
-#include "Core/State.h"
 #include "Core/Slippi/SlippiPlayback.h"
+#include "Core/State.h"
 
 #include "DolphinQt/Host.h"
 #include "DolphinQt/QtUtils/ModalMessageBox.h"