diff --git a/CHANGELOG.md b/CHANGELOG.md
index 96c7fdd..80f7154 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -42,8 +42,32 @@ Update records:
 - Initial organization of RawFileClass_Impl completed.
 - Tested and confirmed to work correctly.
 
+## Launch_Impl
+#### 2025-10-16 IronHammer_Std
+- 整理了CopyProtection部分的实现。
+
+- Organized the implementation of CopyProtection.
+
+## InitCheck_Impl
+#### 2025-10-18 IronHammer_Std
+- 整理了GetFreeDiskSpaceKB的实现。
+
+- Organized the implementation of GetFreeDiskSpaceKB.
+
 ## Debug_Impl
 #### 2025-10-17 IronHammer_Std
 - 恢复了调试日志功能。
 
-- Restored the debug logging functionality.
\ No newline at end of file
+- Restored the debug logging functionality.
+#### 2025-10-17 IronHammer_Std
+- 更新文件操作为CRT的函数。
+
+- Updated file operations to use CRT functions.
+
+## WinMain_Impl
+#### 2025-10-17 IronHammer_Std
+- 替换为了WinMain_Aux以增强日志相关功能。
+- 给出了WinMain的开头一小段的部分实现，并作为部分实现的样例。
+
+- Replaced with WinMain_Aux to enhance logging-related features.
+- Provided a small portion of the implementation at the beginning of WinMain as a sample of partial implementation.
\ No newline at end of file
diff --git a/Patch/Debug.cpp b/Patch/Debug.cpp
index 1eda146..fa80950 100644
--- a/Patch/Debug.cpp
+++ b/Patch/Debug.cpp
@@ -1,12 +1,24 @@
 #include "Debug.h"
 #include <CRT.h>
 #include <MessageListClass.h>
+#include "../src/VanillaImpl.h"
+#include "../src/Debug_Impl.h"
 
 namespace Debug
 {
 	void Log(const char* pFormat, ...)
 	{
-		JMP_STD(0x4068E0);
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			va_list args;
+			va_start(args, pFormat);
+			Debug_Impl::LogWithVArgs(pFormat, args);
+			va_end(args);
+		}
+		else
+		{
+			JMP_STD(0x4068E0);
+		}
 	}
 	void LogAndMessage(const char* pFormat, ...)
 	{
@@ -20,11 +32,25 @@ namespace Debug
 	}
 	void LogString(const char* pStr)
 	{
-		Log("%s", pStr);
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			Debug_Impl::LogString(pStr);
+		}
+		else
+		{
+			Log("%s", pStr);
+		}
 	}
 	void LogString(const std::string& Str)
 	{
-		Log("%s", Str.c_str());
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			Debug_Impl::LogString(Str.c_str());
+		}
+		else
+		{
+			Log("%s", Str.c_str());
+		}
 	}
 	void MessageString(const char* pStr)
 	{
diff --git a/README.md b/README.md
index 55b1ed0..449e081 100644
--- a/README.md
+++ b/README.md
@@ -37,6 +37,12 @@ YRDict 以函数为单位进行整理。
 对单个类的实现，在YRpp当中记录下这个类的Type和具体内容，
 同时，在实现当中以一个Type_Impl来容纳实现。
 
+具体的书写方式，可以参照示例代码和src/ImplBase.h等。
+函数的实现可以是完整的C++代码，也可以是IDA产出的伪代码。
+无论如何，请确保最终的代码能够成功编译通过。
+每个提交的函数按照ImplBase.h的约定标示是否可用。
+例如(PENDING)_IMPLEMENT/(PENDING)_FUNCTION_IMPLEMENT等。
+如果有任何不清楚的地方，欢迎提出Issue进行讨论。
 
 YRDict is organized by functions. For each function, 
 its interface and memory address are documented in projects like YRpp.
@@ -66,6 +72,14 @@ For the implementation of a single class,
 record the Type and specific content of this class in YRpp,
 and at the same time, use a Type_Impl to contain the implementation.
 
+Regarding the specific format, please see the example source files and src/ImplBase.h.
+Implementations can be complete C++ code or IDA-generated pseudocode.
+Anyway, make sure the final code can be built successfully.
+Mark each function's status using the marker symbols defined in ImplBase.h
+e.g., using (PENDING)_IMPLEMENT/(PENDING)_FUNCTION_IMPLEMENT.
+For any questions, we welcome you to start a discussion by opening a new Issue.
+
+
 ## 使用/USAGE
 
 把这个项目编译成DLL，或下载Release当中的DLL。
@@ -78,6 +92,7 @@ and at the same time, use a Type_Impl to contain the implementation.
 
 当然，也可以仅仅拿来参考，或者用来作为自己扩展的基础。
 这个项目的内容是开源的，遵循MIT许可证。
+欢迎基于YRDict开发引擎扩展。
 
 
 Compile this project into a DLL, or download the DLL from the Release page.
@@ -92,6 +107,7 @@ Loading it alongside other extensions may lead to unpredictable behavior.
 Naturally, you are also free to use this project 
 solely for reference or as a foundation for your own extensions.
 The content of this project is open source and follows the MIT license.
+You are welcome to develop game engine extensions based on YRDict.
 
 ## 注意/NOTE
 
@@ -101,8 +117,9 @@ The content of this project is open source and follows the MIT license.
 
 这个项目可以修正WW的原有BUG，但请注明WW原来是怎么写的。
 如果有意愿的话，也可以标注出Ares/Phobos等钩了什么位置以及改变了什么。
-不考虑提供任何的新增或增强逻辑。
-允许也欢迎添加与调试等相关的辅助功能。
+不考虑提供任何的新增玩法或增强的游戏内逻辑。
+允许也欢迎添加与调试等相关的辅助功能和优化补丁。
+
 
 所有源文件和说明文件应统一编码为 UTF8 带BOM格式。
 
@@ -110,6 +127,7 @@ The content of this project is open source and follows the MIT license.
 可以申请加入，并在dev分支上直接开发与提交；
 也可以fork本项目，并在自己的分支当中添加内容。
 以上两种方式都应通过Pull Request的方式合并到main分支。
+注意只会合并通过所有自动检查的PR（如nightly build & changelog check)
 
 Please note that this project does not aim to fully reverse engineer YR. 
 Instead, it focuses on documenting critical functions and implementations.
@@ -121,8 +139,10 @@ This project can fix the original bugs of WW,
 but please indicate how WW was originally written.
 If you are willing, you can also indicate what positions 
 Ares/Phobos, etc. hooked and what changes they made.
-No new or enhanced logic is considered.
-Adding auxiliary features related to debugging and similar tasks is allowed and encouraged.
+No new or enhanced in-game logic is considered.
+Adding auxiliary features related to debugging and similar tasks 
+as well as simple optimization patches is allowed and encouraged.
+
 
 All source files and documentation files 
 should be uniformly encoded in **UTF-8 with BOM** format.
@@ -131,6 +151,8 @@ Everyone, please avoid committing directly to the main branch.
 You can apply to join and develop and commit directly on the dev branch;
 or you can fork this project and add content in your own branch.
 Both methods should merge into the main branch via Pull Request.
+Note that only PRs that pass all automated checks
+(e.g., nightly build & changelog check) will be merged.
 
 ## 结语/CONCLUSION
 
diff --git a/YRpp b/YRpp
index 119136e..c34756e 160000
--- a/YRpp
+++ b/YRpp
@@ -1 +1 @@
-Subproject commit 119136ea15638eb8f6fcc96fe67330b94029679a
+Subproject commit c34756e952b1ea61a41287604e29643e9c9cc352
diff --git a/src/Debug_Impl.cpp b/src/Debug_Impl.cpp
index a413c65..9a39a33 100644
--- a/src/Debug_Impl.cpp
+++ b/src/Debug_Impl.cpp
@@ -2,6 +2,7 @@
 #include "VanillaImpl.h"
 #include <Debug.h>
 #include <Unsorted.h>
+#include <CRT.h>
 
 namespace Debug_Impl
 {
@@ -53,7 +54,7 @@ namespace Debug_Impl
 			MakeLogFile();
 			CloseLogFile(nullptr);
 
-			LogFile = _wfsopen(LogFilePath.c_str(), L"w", _SH_DENYWR);
+			LogFile = CRT::_fsopen(LogFilePath.string().c_str(), "w", _SH_DENYWR);
 			if (!LogFile) {
 				wchar_t msg[100] = L"\0";
 				LogFile = nullptr;
@@ -61,7 +62,7 @@ namespace Debug_Impl
 				MessageBoxW(Game::hWnd, LogFilePath.c_str(), msg, MB_OK | MB_ICONEXCLAMATION);
 				ExitProcess(1);
 			}
-			TempLogFile = _wfsopen(TempLogFilePath.c_str(), L"w", _SH_DENYWR);
+			TempLogFile = CRT::_fsopen(TempLogFilePath.string().c_str(), "w", _SH_DENYWR);
 			if (!TempLogFile) {
 				wchar_t msg[100] = L"\0";
 				TempLogFile = nullptr;
@@ -82,8 +83,8 @@ namespace Debug_Impl
 					Debug::LogString(CloseState);
 				else
 					Debug::LogString("YRDict : Closing Log File...\n");
-				fclose(LogFile);
-				fclose(TempLogFile);
+				CRT::fclose(LogFile);
+				CRT::fclose(TempLogFile);
 				LogFile = nullptr;
 				TempLogFile = nullptr;
 			}
@@ -96,8 +97,8 @@ namespace Debug_Impl
 		{
 			if (IsLogFileOpen())
 			{
-				fflush(LogFile);
-				fflush(TempLogFile);
+				CRT::fflush(LogFile);
+				CRT::fflush(TempLogFile);
 			}
 		}
 	}
@@ -106,8 +107,17 @@ namespace Debug_Impl
 	{
 		if constexpr (!UseVanillaImpl_Supplementary)
 		{
-			vfprintf(LogFile, pFormat, args);
-			vfprintf(TempLogFile, pFormat, args);
+			CRT::vfprintf(LogFile, pFormat, args);
+			CRT::vfprintf(TempLogFile, pFormat, args);
+		}
+	}
+
+	void LogUnflushed(const char* Str)
+	{
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			CRT::fprintf(LogFile, "%s", Str);
+			CRT::fprintf(TempLogFile, "%s", Str);
 		}
 	}
 
@@ -126,4 +136,30 @@ namespace Debug_Impl
 			FlushLogFile();
 		}
 	}
+
+	void LogWithVArgs(const char* pFormat, va_list args)
+	{
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			if (!IsLogFileOpen())
+				OpenLogFile();
+
+			LogWithVArgsUnflushed(pFormat, args);
+
+			FlushLogFile();
+		}
+	}
+
+	void LogString(const char* Str)
+	{
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			if (!IsLogFileOpen())
+				OpenLogFile();
+			
+			LogUnflushed(Str);
+
+			FlushLogFile();
+		}
+	}
 }
\ No newline at end of file
diff --git a/src/Debug_Impl.h b/src/Debug_Impl.h
index 6577de2..21c7105 100644
--- a/src/Debug_Impl.h
+++ b/src/Debug_Impl.h
@@ -18,8 +18,12 @@ namespace Debug_Impl
 	void CloseLogFile(const char* CloseState);
 	void FlushLogFile();
 	void LogWithVArgsUnflushed(const char* pFormat, va_list args);
+	void LogUnflushed(const char* Str);
 
 	void __cdecl Log(const char* pFormat, ...);
 	FUNCTION_IMPLEMENT(0x4A4AC0, Log);
 	FUNCTION_IMPLEMENT(0x4068E0, Log);
+
+	void LogWithVArgs(const char* pFormat, va_list args);
+	void LogString(const char* Str);
 }
\ No newline at end of file
diff --git a/src/FileClass_Impl.h b/src/FileClass_Impl.h
index 588a211..0e1abac 100644
--- a/src/FileClass_Impl.h
+++ b/src/FileClass_Impl.h
@@ -84,7 +84,7 @@ DEFINE_VIRTUAL_IMPL(RawFileClass, 0x7F0904u)
 	void Close();
 	DWORD GetFileTime();
 	bool SetFileTime(DWORD FileTime);
-	void CDCheck(DWORD ErrorCode, bool bUnk, const char* FileName) {}
+	void CDCheck(DWORD ErrorCode, bool canRetry, const char* FileName) {}
 
 	//Non-virtual Function Implements
 	void Bias(int offset = 0, int length = -1);
diff --git a/src/ImplBase.h b/src/ImplBase.h
index fd335f0..84f0e6f 100644
--- a/src/ImplBase.h
+++ b/src/ImplBase.h
@@ -181,6 +181,13 @@ See details in FileClass_Impl.h
 #define DEFINE_IMPLEMENT \
 	inline static void Implement()
 
+/*
+
+什么也不会干，标记此处在完成实现之后应该换成IMPLEMENT
+Does nothing; marks this location to be replaced with IMPLEMENT after the implementation is complete.
+
+*/
+#define PENDING_IMPLEMENT(Addr, Method) 
 
 /*
 
@@ -287,7 +294,7 @@ See details in FileClass_Impl.h
 
 /*
 
-为普通函数生成实现补丁，放在函数的实现后面。
+为非成员函数生成实现补丁，放在函数的实现后面。
 Generate Implementation Patch for Non-member Functions.
 For use after the function's implementation.
 
@@ -300,8 +307,16 @@ See details in Launch_Impl.h
 
 /*
 
-为尚未实现的函数生成跳转到原函数的补丁，放在函数的声明后面。
-Generate Jump-to-Original Patch for Not-Yet-Implemented Functions.
+什么也不会干，标记此处在完成实现之后应该换成FUNCTION_IMPLEMENT
+Does nothing; marks this location to be replaced with FUNCTION_IMPLEMENT after the implementation is complete.
+
+*/
+#define PENDING_FUNCTION_IMPLEMENT(Addr, Func) 
+
+/*
+
+为尚未实现的非成员函数生成跳转到原函数的补丁，放在函数的声明后面。
+Generate Jump-to-Original Patch for Not-Yet-Implemented Non-member Functions.
 For use after the function's declaration.
 
 详见示例 Launch_Impl.h
diff --git a/src/Launch_Impl.cpp b/src/Launch_Impl.cpp
index 4e1fffc..63e0ded 100644
--- a/src/Launch_Impl.cpp
+++ b/src/Launch_Impl.cpp
@@ -1,7 +1,7 @@
 #include "Launch_Impl.h"
 #include "Windows.h"
 #include <VersionClass.h>
-
+#include <Unsorted.h>
 
 namespace CopyProtection_Impl
 {
@@ -67,10 +67,10 @@ namespace CopyProtection_Impl
                 {
                     while (!PeekMessageA(
                         &Msg, 0,
-                        Launcher_HereIAm_MessageID,
-                        Launcher_HereIAm_MessageID,
+                        Launcher_HereIAm_Message,
+                        Launcher_HereIAm_Message,
                         PM_REMOVE) ||
-                        Msg.message != Launcher_HereIAm_MessageID)
+                        Msg.message != Launcher_HereIAm_Message)
                     {
                         Sleep(0);
                         if (timeGetTime() > NextCheckTime)
@@ -187,3 +187,55 @@ namespace CopyProtection_Impl
     }
 }
 
+
+namespace InitCheck_Impl
+{
+    DWORD GetFreeDiskSpaceKB()
+    {
+        HMODULE hKernal32; 
+        BOOL(__stdcall * GetDiskFreeSpaceExA)(LPCSTR, PULARGE_INTEGER, PULARGE_INTEGER, PULARGE_INTEGER); 
+        unsigned int FreeDiskSpaceKB; 
+        DWORD SectorsPerCluster; 
+        DWORD BytesPerSector; 
+        DWORD NumberOfFreeClusters; 
+        DWORD TotalNumberOfClusters;
+        ULARGE_INTEGER FreeBytesAvailableToCaller; 
+        ULARGE_INTEGER TotalNumberOfFreeBytes; 
+        ULARGE_INTEGER TotalNumberOfBytes; 
+
+        Debug::LogString("Checking available disk space\n");
+        hKernal32 = GetModuleHandleA("KERNEL32.DLL");
+        if (hKernal32)
+        {
+            GetDiskFreeSpaceExA = reinterpret_cast<decltype(GetDiskFreeSpaceExA)>
+                (GetProcAddress(hKernal32, "GetDiskFreeSpaceExA"));
+            if (GetDiskFreeSpaceExA)
+            {
+                Debug::LogString("Using GetDiskFreeSpaceEx\n");
+                if (GetDiskFreeSpaceExA(NULL, &FreeBytesAvailableToCaller, &TotalNumberOfBytes, &TotalNumberOfFreeBytes))
+                {
+                    FreeDiskSpaceKB = Game::F2I64((FreeBytesAvailableToCaller.HighPart * 4294967296.0 + FreeBytesAvailableToCaller.LowPart) * 0.0009765625);
+                    Debug::Log("Free disk space is %d Mb\n", FreeDiskSpaceKB >> 10);
+                    return FreeDiskSpaceKB;
+                }
+
+                //why there is 0 to %s ?!
+                Debug::Log("GetDiskFreeSpaceEx failed with error code %d - %s\n", GetLastError(), 0);
+            }
+            else
+            {
+                //why there is 0 to %s ?!
+                Debug::Log("GetProcAddress failed with error code %d - %s\n", GetLastError(), 0);
+            }
+        }
+        else
+        {
+            Debug::LogString("Failed to get module handle for KERNEL32.DLL\n");
+        }
+        if (!GetDiskFreeSpaceA(0, &SectorsPerCluster, &BytesPerSector, &NumberOfFreeClusters, &TotalNumberOfClusters))
+            return 0;
+        FreeDiskSpaceKB = NumberOfFreeClusters * ((BytesPerSector * SectorsPerCluster) >> 10);
+        Debug::Log("Free disk space is %d Mb\n", FreeDiskSpaceKB >> 10);
+        return FreeDiskSpaceKB;
+    }
+}
\ No newline at end of file
diff --git a/src/Launch_Impl.h b/src/Launch_Impl.h
index 332b00f..6b5e787 100644
--- a/src/Launch_Impl.h
+++ b/src/Launch_Impl.h
@@ -8,8 +8,7 @@ namespace CopyProtection_Impl
 	inline const char* MutexGUID = "48BC11BD-C4D7-466b-8A31-C6ABBAD47B3E";
 	inline const char* NotifySignalGUID = "D6E7FC97-64F9-4d28-B52C-754EDF721C6F";
 	inline const char* Launcher_RegKey = "WChat\\SysID";
-	inline const UINT Launcher_HereIAm_MessageID = 0xBEEFu;
-	inline const UINT Launcher_HereIAm_Message = 48879;
+	inline const UINT Launcher_HereIAm_Message = 0xBEEFu;
 
 	bool IsLauncherRunning();
 	FUNCTION_IMPLEMENT(0x49F5C0, IsLauncherRunning);
@@ -32,4 +31,10 @@ namespace CopyProtection_Impl
 	inline const char* mProtectData_Failed = "EEK!";
 	inline const char* mProtectData_Success = "UIDATA,3DDATA,MAPS";
 	DEFINE_REFERENCE(char*, _mProtectedData, 0x89F75C)
+};
+
+namespace InitCheck_Impl
+{
+	DWORD GetFreeDiskSpaceKB();
+	FUNCTION_IMPLEMENT(0x48DD50, GetFreeDiskSpaceKB);
 }
\ No newline at end of file
diff --git a/src/WinMain_Impl.cpp b/src/WinMain_Impl.cpp
index 4f3fee3..cb1ef31 100644
--- a/src/WinMain_Impl.cpp
+++ b/src/WinMain_Impl.cpp
@@ -2,6 +2,9 @@
 #include "Debug_Impl.h"
 #include <SystemData.h>
 #include <CRT.h>
+#include <Unsorted.h>
+#include <Debug.h>
+#include "Launch_Impl.h"
 
 namespace WinMain_Impl
 {
@@ -9,7 +12,7 @@ namespace WinMain_Impl
 	{
 		Debug_Impl::CloseLogFile("YRDict : Closing Log File at exit...\n");
 	}
-	
+
 
 	int __stdcall WinMain_Aux(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
 	{
@@ -25,4 +28,107 @@ namespace WinMain_Impl
 		}
 		return Result;
 	}
+
+	
+	int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
+	{
+		//Initialize system params
+		Game::hInstance = hInstance;
+		Game::MainThreadId = ::GetCurrentThreadId();
+
+		//Show that WW is genius
+		if constexpr (!UseVanillaImpl_Supplementary)
+		{
+			//WW is so genius that we cannot understand the idea behind these numbers
+			Debug::Log("%d-%d\n", 1660, 152);
+			Debug::Log("%d-%d\n", 1661, 76);
+			Debug::Log("%d-%d\n", 1662, 76);
+			Debug::Log("%d-%d\n", 1663, 19);
+			Debug::Log("%d-%d\n", 1664, 3608);
+			Debug::Log("%d-%d\n", 1665, 1752);
+			Debug::Log("%d-%d\n", 1666, 3600);
+			Debug::Log("%d-%d\n", 1667, 272);
+			Debug::Log("%d-%d\n", 1668, 456);
+			Debug::Log("%d-%d\n", 1669, 888);
+			Debug::Log("%d-%d\n", 1670, 120);
+			Debug::Log("%d-%d\n", 1671, 1824);
+			Debug::Log("%d-%d\n", 1672, 6040);
+			Debug::Log("%d-%d\n", 1673, 352);
+			Debug::Log("%d-%d\n", 1674, 760);
+			Debug::Log("%d-%d\n", 1675, 328);
+			Debug::Log("%d-%d\n", 1676, 116);
+			Debug::Log("%d-%d\n", 1677, 90296);
+			Debug::Log("%d-%d\n", 1678, 432);
+			Debug::Log("%d-%d\n", 1679, 1776);
+			Debug::Log("%d-%d\n", 1680, 3792);
+			Debug::Log("%d-%d\n", 1681, 24);
+			Debug::Log("%d-%d\n", 1682, 21868);
+			Debug::Log("%d-%d\n", 1683, 3608);
+			Debug::Log("%d-%d\n", 1684, 176);
+			Debug::Log("%d-%d\n", 1685, 700);
+			Debug::Log("%d-%d\n", 1686, 176);
+			Debug::Log("%d-%d\n", 1687, 676);
+			Debug::Log("%d-%d\n", 1688, 212);
+			Debug::Log("%d-%d\n", 1689, 160);
+			Debug::Log("%d-%d\n", 1690, 248);
+			Debug::Log("%d-%d\n", 1691, 224);
+			Debug::Log("%d-%d\n", 1692, 700);
+			Debug::Log("%d-%d\n", 1693, 72);
+			Debug::Log("%d-%d\n", 1694, 180);
+			Debug::Log("%d-%d\n", 1695, 164);
+			Debug::Log("%d-%d\n", 1696, 56);
+			Debug::Log("%d-%d\n", 1697, 2280);
+			Debug::Log("%d-%d\n", 1698, 3704);
+			Debug::Log("%d-%d\n", 1699, 14144);
+			Debug::Log("%d-%d\n", 1700, 256);
+			Debug::Log("%d-%d\n", 1701, 128);
+			Debug::Log("%d-%d\n", 1702, 432);
+			Debug::Log("%d-%d\n", 1703, 6336);
+			Debug::Log("%d-%d\n", 1704, 1024);
+			Debug::Log("%d-%d\n", 1705, 1);
+			Debug::Log("%d-%d\n", 1706, 1312);
+			Debug::Log("%d-%d\n", 1707, 240);
+			Debug::Log("%d-%d\n", 1708, 212);
+			Debug::Log("%d-%d\n", 1709, 8);
+			Debug::Log("%d-%d\n", 1710, 28);
+			Debug::Log("%d-%d\n", 1711, 4);
+			Debug::Log("%d-%d\n", 1712, 8);
+			Debug::Log("%d-%d\n", 1713, 16);
+			Debug::Log("%d-%d\n", 1714, 32);
+			Debug::Log("%d-%d\n", 1715, 24);
+		}
+
+		// return true if Launcher is found
+		if (!CopyProtection_Impl::IsLauncherRunning())
+		{
+			// CopyProtection -- Exit if Launcher isn't found
+			Debug::LogString("Launcher not running....Bail!\n");
+			return 0;
+		}
+
+		//Ensure that there is only 1 Instance
+		//including TS/FS/RA2/YR
+		Game::GameInstanceMutex = CreateMutexA(0, FALSE, GameInstanceMutex_UUID);
+		if (GetLastError() == ERROR_ALREADY_EXISTS)
+		{
+			HWND hWnd_FromMutex = FindWindowA(GameInstanceMutex_UUID, NULL);
+			if (hWnd_FromMutex)
+			{
+				SetForegroundWindow(hWnd_FromMutex);
+				ShowWindow(hWnd_FromMutex, SW_RESTORE);
+			}
+			if (Game::GameInstanceMutex)
+			{
+				CloseHandle(Game::GameInstanceMutex);
+				Game::GameInstanceMutex = NULL;
+			}
+			Debug::LogString("TibSun is already running...Bail!\n");
+			// Exit -- Game is already running
+			return 0;                                  
+		}
+		// Ensure that only one game instance is running
+		Debug::LogString("Create AppMutex okay.\n");                    
+
+		//To be Implemented
+	}
 }
\ No newline at end of file
diff --git a/src/WinMain_Impl.h b/src/WinMain_Impl.h
index 5e137fd..82bed37 100644
--- a/src/WinMain_Impl.h
+++ b/src/WinMain_Impl.h
@@ -12,4 +12,15 @@ namespace WinMain_Impl
 	//Replace the original WinMain call so as to insert our own initialization code
 	int __stdcall WinMain_Aux(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow);
 	FUNCTION_CALL_AUX(0x7CD8EA, WinMain_Aux)
+
+
+	inline const char* GameInstanceMutex_UUID = "29e3bb2a-2f36-11d3-a72c-0090272fa661";
+
+	/*
+	* 
+	* As an example of partial implementation
+	* 
+	*/
+	int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow);
+	PENDING_FUNCTION_IMPLEMENT(0x6BB9A0, WinMain)
 }
\ No newline at end of file