diff --git a/rpcs3/Emu/Cell/Modules/cellGame.cpp b/rpcs3/Emu/Cell/Modules/cellGame.cpp
index 1b61cb66f1..5d2222b281 100644
--- a/rpcs3/Emu/Cell/Modules/cellGame.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellGame.cpp
@@ -218,22 +218,43 @@ s32 cellHddGameGetSizeKB(vm::ptr<u32> size)
 	return CELL_OK;
 }
 
-s32 cellHddGameSetSystemVer()
+s32 cellHddGameSetSystemVer(vm::cptr<char> systemVersion)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellHddGameSetSystemVer(systemVersion=%s)", systemVersion);
+
+	if (!systemVersion)
+	{
+		return CELL_HDDGAME_ERROR_PARAM;
+	}
+
 	return CELL_OK;
 }
 
 s32 cellHddGameExitBroken()
 {
-	fmt::throw_exception("Unimplemented" HERE);
-}
+	cellGame.warning("cellHddGameExitBroken()");
 
+	s32 res = open_msg_dialog(CELL_MSGDIALOG_TYPE_SE_TYPE_ERROR | CELL_MSGDIALOG_TYPE_BUTTON_TYPE_OK | CELL_MSGDIALOG_TYPE_DISABLE_CANCEL_ON,
+		vm::make_str("There has been an error!\n\nPlease reinstall the HDD boot game."));
+
+	if (res != CELL_OK)
+	{
+		return CELL_HDDGAME_ERROR_INTERNAL;
+	}
+
+	sysutil_send_system_cmd(CELL_SYSUTIL_REQUEST_EXITGAME, 0);
+	return CELL_OK;
+}
 
 s32 cellGameDataGetSizeKB(vm::ptr<u32> size)
 {
 	cellGame.warning("cellGameDataGetSizeKB(size=*0x%x)", size);
 
+	if (!size)
+	{
+		return CELL_GAMEDATA_ERROR_PARAM;
+	}
+
 	const std::string local_dir = vfs::get(Emu.GetDir());
 
 	if (!fs::is_dir(local_dir))
@@ -246,17 +267,33 @@ s32 cellGameDataGetSizeKB(vm::ptr<u32> size)
 	return CELL_OK;
 }
 
-s32 cellGameDataSetSystemVer()
+s32 cellGameDataSetSystemVer(vm::cptr<char> systemVersion)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameDataSetSystemVer(systemVersion=%s)", systemVersion);
+
+	if (!systemVersion)
+	{
+		return CELL_GAMEDATA_ERROR_PARAM;
+	}
+
 	return CELL_OK;
 }
 
 s32 cellGameDataExitBroken()
 {
-	fmt::throw_exception("Unimplemented" HERE);
-}
+	cellGame.warning("cellGameDataExitBroken()");
 
+	s32 res = open_msg_dialog(CELL_MSGDIALOG_TYPE_SE_TYPE_ERROR | CELL_MSGDIALOG_TYPE_BUTTON_TYPE_OK | CELL_MSGDIALOG_TYPE_DISABLE_CANCEL_ON,
+		vm::make_str("There has been an error!\n\nPlease delete the game's game data."));
+
+	if (res != CELL_OK)
+	{
+		return CELL_GAMEDATA_ERROR_INTERNAL;
+	}
+
+	sysutil_send_system_cmd(CELL_SYSUTIL_REQUEST_EXITGAME, 0);
+	return CELL_OK;
+}
 
 error_code cellGameBootCheck(vm::ptr<u32> type, vm::ptr<u32> attributes, vm::ptr<CellGameContentSize> size, vm::ptr<char[CELL_GAME_DIRNAME_SIZE]> dirName)
 {
@@ -629,9 +666,15 @@ error_code cellGameCreateGameData(vm::ptr<CellGameSetInitParams> init, vm::ptr<c
 	return CELL_OK;
 }
 
-s32 cellGameDeleteGameData()
+s32 cellGameDeleteGameData(vm::cptr<char> dirName)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameDeleteGameData(dirName=%s)", dirName);
+
+	if (!dirName)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	return CELL_OK;
 }
 
@@ -639,6 +682,11 @@ error_code cellGameGetParamInt(s32 id, vm::ptr<s32> value)
 {
 	cellGame.warning("cellGameGetParamInt(id=%d, value=*0x%x)", id, value);
 
+	if (!value)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	const auto prm = fxm::get<content_permission>();
 
 	if (!prm)
@@ -772,6 +820,11 @@ error_code cellGameGetSizeKB(vm::ptr<s32> size)
 {
 	cellGame.warning("cellGameGetSizeKB(size=*0x%x)", size);
 
+	if (!size)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	const auto prm = fxm::get<content_permission>();
 
 	if (!prm)
@@ -791,15 +844,27 @@ error_code cellGameGetSizeKB(vm::ptr<s32> size)
 	return CELL_OK;
 }
 
-s32 cellGameGetDiscContentInfoUpdatePath()
+s32 cellGameGetDiscContentInfoUpdatePath(vm::ptr<char> updatePath)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameGetDiscContentInfoUpdatePath(updatePath=*0x%x)", updatePath);
+
+	if (!updatePath)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	return CELL_OK;
 }
 
-s32 cellGameGetLocalWebContentPath()
+s32 cellGameGetLocalWebContentPath(vm::ptr<char> contentPath)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameGetLocalWebContentPath(contentPath=*0x%x)", contentPath);
+
+	if (!contentPath)
+	{
+		return CELL_GAME_ERROR_PARAM;
+	}
+
 	return CELL_OK;
 }
 
@@ -834,45 +899,30 @@ error_code cellGameContentErrorDialog(s32 type, s32 errNeedSizeKB, vm::cptr<char
 		errorMsg += fmt::format("\nDirectory name: %s", dirName);
 	}
 
-	const auto dlg = Emu.GetCallbacks().get_msg_dialog();
+	verify(HERE), CELL_OK == open_msg_dialog(CELL_MSGDIALOG_TYPE_SE_TYPE_ERROR | CELL_MSGDIALOG_TYPE_BUTTON_TYPE_OK | CELL_MSGDIALOG_TYPE_DISABLE_CANCEL_ON, vm::make_str(errorMsg));
 
-	dlg->type.bg_invisible = true;
-	dlg->type.button_type = 2; // OK
-	dlg->type.disable_cancel = true;
+	return CELL_OK;
+}
 
-	atomic_t<bool> result(false);
+s32 cellGameThemeInstall(vm::cptr<char> usrdirPath, vm::cptr<char> fileName, u32 option)
+{
+	cellGame.todo("cellGameThemeInstall(usrdirPath=%s, fileName=%s, option=0x%x)", usrdirPath, fileName, option);
 
-	dlg->on_close = [&](s32 status)
+	if (!fileName || !usrdirPath || usrdirPath.size() > CELL_GAME_PATH_MAX)
 	{
-		result = true;
-	};
-
-	Emu.CallAfter([&]()
-	{
-		dlg->Create(errorMsg);
-	});
-
-	while (!result)
-	{
-		thread_ctrl::wait_for(1000);
+		return CELL_GAME_ERROR_PARAM;
 	}
 
 	return CELL_OK;
 }
 
-s32 cellGameThemeInstall()
+s32 cellGameThemeInstallFromBuffer(u32 fileSize, u32 bufSize, vm::ptr<void> buf, vm::ptr<CellGameThemeInstallCallback> func, u32 option)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameThemeInstallFromBuffer(fileSize=%d, bufSize=%d, buf=*0x%x, func=*0x%x, option=0x%x)", fileSize, bufSize, buf, func, option);
+
 	return CELL_OK;
 }
 
-s32 cellGameThemeInstallFromBuffer()
-{
-	UNIMPLEMENTED_FUNC(cellGame);
-	return CELL_OK;
-}
-
-
 s32 cellDiscGameGetBootDiscInfo(vm::ptr<CellDiscGameSystemFileParam> getParam)
 {
 	cellGame.warning("cellDiscGameGetBootDiscInfo(getParam=*0x%x)", getParam);
@@ -899,31 +949,34 @@ s32 cellDiscGameGetBootDiscInfo(vm::ptr<CellDiscGameSystemFileParam> getParam)
 	return CELL_OK;
 }
 
-s32 cellDiscGameRegisterDiscChangeCallback()
+s32 cellDiscGameRegisterDiscChangeCallback(vm::ptr<CellDiscGameDiscEjectCallback> funcEject, vm::ptr<CellDiscGameDiscInsertCallback> funcInsert)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellDiscGameRegisterDiscChangeCallback(funcEject=*0x%x, funcInsert=*0x%x)", funcEject, funcInsert);
+
 	return CELL_OK;
 }
 
 s32 cellDiscGameUnregisterDiscChangeCallback()
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellDiscGameUnregisterDiscChangeCallback()");
+
 	return CELL_OK;
 }
 
-s32 cellGameRegisterDiscChangeCallback()
+s32 cellGameRegisterDiscChangeCallback(vm::ptr<CellGameDiscEjectCallback> funcEject, vm::ptr<CellGameDiscInsertCallback> funcInsert)
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameRegisterDiscChangeCallback(funcEject=*0x%x, funcInsert=*0x%x)", funcEject, funcInsert);
+
 	return CELL_OK;
 }
 
 s32 cellGameUnregisterDiscChangeCallback()
 {
-	UNIMPLEMENTED_FUNC(cellGame);
+	cellGame.todo("cellGameUnregisterDiscChangeCallback()");
+
 	return CELL_OK;
 }
 
-
 void cellSysutil_GameData_init()
 {
 	REG_FUNC(cellSysutil, cellHddGameCheck);
diff --git a/rpcs3/Emu/Cell/Modules/cellGame.h b/rpcs3/Emu/Cell/Modules/cellGame.h
index a84ccff9ed..91d01bc5d1 100644
--- a/rpcs3/Emu/Cell/Modules/cellGame.h
+++ b/rpcs3/Emu/Cell/Modules/cellGame.h
@@ -57,6 +57,7 @@ enum
 	CELL_GAME_DIRNAME_SIZE       = 32,
 	CELL_GAME_HDDGAMEPATH_SIZE   = 128,
 	CELL_GAME_THEMEFILENAME_SIZE = 48,
+
 	CELL_GAME_SYSP_LANGUAGE_NUM  = 20,
 	CELL_GAME_SYSP_TITLE_SIZE    = 128,
 	CELL_GAME_SYSP_TITLEID_SIZE  = 10,
@@ -64,12 +65,11 @@ enum
 	CELL_GAME_SYSP_PS3_SYSTEM_VER_SIZE = 8,
 	CELL_GAME_SYSP_APP_VER_SIZE  = 6,
 
-	CELL_GAME_GAMETYPE_SYS  = 0,
-	CELL_GAME_GAMETYPE_DISC = 1,
-	CELL_GAME_GAMETYPE_HDD  = 2,
-	CELL_GAME_GAMETYPE_HOME = 4,
-
+	CELL_GAME_GAMETYPE_SYS      = 0,
+	CELL_GAME_GAMETYPE_DISC     = 1,
+	CELL_GAME_GAMETYPE_HDD      = 2,
 	CELL_GAME_GAMETYPE_GAMEDATA = 3,
+	CELL_GAME_GAMETYPE_HOME     = 4,
 
 	CELL_GAME_SIZEKB_NOTCALC = -1,
 
@@ -81,6 +81,12 @@ enum
 	CELL_GAME_ATTRIBUTE_INVITE_MESSAGE      = 0x20,
 	CELL_GAME_ATTRIBUTE_CUSTOM_DATA_MESSAGE = 0x40,
 	CELL_GAME_ATTRIBUTE_WEB_BROWSER         = 0x100,
+
+	CELL_GAME_THEME_OPTION_NONE  = 0x0,
+	CELL_GAME_THEME_OPTION_APPLY = 0x1,
+
+	CELL_GAME_DISCTYPE_OTHER = 0,
+	CELL_GAME_DISCTYPE_PS3   = 1,
 };
 
 //Parameter IDs of PARAM.SFO
@@ -202,7 +208,9 @@ struct CellGameDataSystemFileParam
 	be_t<u32> attribute;
 	char reserved2[256];
 };
-struct CellDiscGameSystemFileParam {
+
+struct CellDiscGameSystemFileParam
+{
 	char titleId[CELL_DISCGAME_SYSP_TITLEID_SIZE];
 	char reserved0[2];
 	be_t<u32> parentalLevel;
@@ -319,3 +327,8 @@ struct CellHddGameStatSet
 };
 
 typedef void(CellHddGameStatCallback)(vm::ptr<CellHddGameCBResult> cbResult, vm::ptr<CellHddGameStatGet> get, vm::ptr<CellHddGameStatSet> set);
+typedef void(CellGameThemeInstallCallback)(u32 fileOffset, u32 readSize, vm::ptr<void> buf);
+typedef void(CellGameDiscEjectCallback)(void);
+typedef void(CellGameDiscInsertCallback)(u32 discType, vm::ptr<char> titleId);
+typedef void(CellDiscGameDiscEjectCallback)(void);
+typedef void(CellDiscGameDiscInsertCallback)(u32 discType, vm::ptr<char> titleId);
diff --git a/rpcs3/Emu/Cell/Modules/cellMsgDialog.cpp b/rpcs3/Emu/Cell/Modules/cellMsgDialog.cpp
index 5e8113bc8e..43a335ba60 100644
--- a/rpcs3/Emu/Cell/Modules/cellMsgDialog.cpp
+++ b/rpcs3/Emu/Cell/Modules/cellMsgDialog.cpp
@@ -19,7 +19,7 @@ MsgDialogBase::~MsgDialogBase()
 s32 cellMsgDialogOpen2(u32 type, vm::cptr<char> msgString, vm::ptr<CellMsgDialogCallback> callback, vm::ptr<void> userData, vm::ptr<void> extParam);
 
 // wrapper to call for other hle dialogs
-s32 open_msg_dialog(u32 type, vm::cptr<char> msgString, vm::ptr<CellMsgDialogCallback> callback = vm::null, vm::ptr<void> userData = vm::null, vm::ptr<void> extParam = vm::null)
+s32 open_msg_dialog(u32 type, vm::cptr<char> msgString, vm::ptr<CellMsgDialogCallback> callback, vm::ptr<void> userData, vm::ptr<void> extParam)
 {
 	cellSysutil.warning("open_msg_dialog called. This will call cellMsgDialogOpen2");
 	return cellMsgDialogOpen2(type, msgString, callback, userData, extParam);
diff --git a/rpcs3/Emu/Cell/Modules/cellMsgDialog.h b/rpcs3/Emu/Cell/Modules/cellMsgDialog.h
index 6a428b3075..930edbffb1 100644
--- a/rpcs3/Emu/Cell/Modules/cellMsgDialog.h
+++ b/rpcs3/Emu/Cell/Modules/cellMsgDialog.h
@@ -71,7 +71,7 @@ enum class MsgDialogState
 	Close,
 };
 
-s32 open_msg_dialog(u32 type, vm::cptr<char> msgString, vm::ptr<CellMsgDialogCallback> callback, vm::ptr<void> userData, vm::ptr<void> extParam);
+s32 open_msg_dialog(u32 type, vm::cptr<char> msgString, vm::ptr<CellMsgDialogCallback> callback = vm::null, vm::ptr<void> userData = vm::null, vm::ptr<void> extParam = vm::null);
 
 class MsgDialogBase
 {