If you are looking for ways to play the game on modern hardware as of 2021–2026, consider these official or highly-regarded community options: Xbox Series X/S (Recommended)

Sonic Unleashed is an action-adventure platformer game developed by Sonic Team and published by Sega. The game was initially released in 2008 for various platforms, including the PlayStation 2, PlayStation 3, Wii, and Xbox 360.

However, I can offer a about the game’s status on PSP: