While it’s tempting to look for a "free download" of , you should be careful. Most sites offering the full version for free are unofficial and can bundle the game with malware or viruses that put your PC at risk [2].
If you do manage to get the PC version, look for the "Sonic Heroes Essentials" mod. It fixes widescreen issues and crashes that happen on Windows 10 and 11 [1]. Why Avoid "Free Full Version" Sites? sonic-heroes-pc-game-free-download-full-version
Since the game was released in 2003 and is now considered "abandonware" (no longer sold by Sega on digital storefronts like Steam), here is the safest way to play it today: While it’s tempting to look for a "free