Sonic's Ultimate Genesis Collection compiles 40 emulated games originally released for the Sega Genesis by Sega. Additionally, eight non-Genesis games are unlockable by completing achievements in select titles. Many of the games featured were originally included in the compilation's predecessor Sega Genesis Collection (2006).
Games included in Sonic's Ultimate Genesis Collection
12Altered Beast is included twice in the compilation. The default version featured in the collection is its Sega Genesis port, while the unlockable variant is the original arcade game.
↑Included under original name, Tip-Top, in some regions.
According to Ethan Einhorn, the producer for the collection, the three "lock-on" games (Knuckles in Sonic 2, Sonic 3 & Knuckles, and Blue Sphere) were not included due to "tight development times", and that including them would have meant "dropping several titles from the collection altogether", specifically the aforementioned nine unlockable games since "they all required unique emulation solutions".[citation needed]
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