You need a legitimate Xbox 360 ISO of the game, plus its Title Update and DLC files.
: Tools like ImgBurn or Xbox 360 Backup Creator are commonly used. 2. Step-by-Step Dumping Guide Sonic Unleashed Iso Xbox 360
This is an unofficial native PC port rather than an emulator. It recompiles the original Xbox 360 code into native machine code, providing significantly better performance and stability. You need a legitimate Xbox 360 ISO of
If you prefer a standard emulation experience, the build is the most stable way to run the Xbox 360 version. Sonic Unleashed Iso Xbox 360