Sonic 1 Mixed Beta 1.1 is a ROM hack of Sonic the Hedgehog for Sega Genesis. Similar to version 1.2, this hack combines elements from various beta versions of the original game. The lower version number indicates an earlier version with possibly fewer features or more bugs than 1.2. The developers are likely independent ROM hackers working on unofficial modifications of the original title. The original Sonic the Hedgehog game was released by Sega in 1991.

Sonic 1 Mixed Beta1.1

Sonic 1 Mania Edition