GTA III Internal Trainer (v0.2)

An internal mod menu for Grand Theft Auto III (Steam) using ImGui and Minhook. All Memory Addresses used have been manually found by me without searching them online, as i also wanted to improve my RE skills, i did occasionally check the re3 repo to look at the already reverse engineered code, to sort of see how the game works in certain aspects.

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✨ Features

• Player Module:
  • Health & Armor editing.
  • Money manipulation.
  • Godmode
  • Never Wanted
  • Set Wanted Level
  • Coordinate-based Teleportation (X, Y, Z).
• Vehicle Module:
  • Vehicle Spawner.
  • The "Rhino Exploit": The Spawner modifies the GIVEUSATANK cheat to be able to spawn any wheeled vehicle, to fully function, i created a codecave and redirected the execution towards it, this had to be done since it could only spawn ids up until 127, which i presume was due to a compiler optimization since the rhino id was 122.
• Weapon Module:
  • Weapon spawning
  • Includes options as set ammo, set infinite ammo, get all weapons at once.
• UI:
  • Toggle visibility with the F5 key.

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📸 Preview

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🚀 Building from Source

This project uses CMake and MinGW-w64.

Prerequisites

• CMake (3.10+)
• MinGW-w64 (GCC/G++) installed and added to System PATH.

Compilation

1. Clone the repository:

   git clone https://github.com/31cmTrueDamage/Thunar-s-GTA-III-Trainer-Menu.git
   cd Thunar-s-GTA-III-Trainer-Menu

2. Generate the build files: Run the following in the root folder. If your compilers are not in your PATH, you can specify them manually as shown:

   # Standard way (if in PATH):
   cmake -B build -G "MinGW Makefiles"

   # Manual way (if not in PATH):
   cmake -B build -G "MinGW Makefiles" -DCMAKE_C_COMPILER=gcc -DCMAKE_CXX_COMPILER=g++

3. Compile the DLL:

   cmake --build build

The compiled GTA3Trainer.dll will be located in the /build directory.

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📋 Usage

1. Launch GTA III (v1.0).
2. Use a DLL Injector of your choice to inject GTA3Trainer.dll (I used XENOS, but any should work).
3. Press F5 in-game to open the menu.
4. Have fun

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🛡️ Disclaimer

This project is for educational and research purposes only. It is intended to showcase memory management and assembly-level programming within legacy game engines. Use responsibly.