Iconic levels like Green Hill, Chemical Plant, and City Escape rebuilt in HD. Refined Gameplay:

: The original runs efficiently on older PC hardware while still supporting modern resolutions.

When you specifically search for the , you are likely looking for the "Custom Optimization" (CO) aspect. The console versions are locked at 30 or 60 FPS with fixed resolutions. The PC version, however, is legendary for its modding community.

likely refers to a specific, potentially illegitimate, repack or download source for the original 2011 game Sonic Generations