Stolen (and slightly cleaned up) version of The Simpsons: Hit & Run original source code from 2003 - GitHub - Svxy/The-Simpsons-Hit-and-Run: Stolen (and slightly cleaned up) version of The Simp...
It's the code of the original game. If you build it, you will get the same version as the original. It also maybe work a bit faster due to modern compiler optimizations.
But leaked source code could potential lead to a maintained fork that improves the original game like https://github.com/OpenXRay