Sonic the Hedgehog 2 (World) (Rev A) is a ROM of the original Sonic the Hedgehog 2 for the Sega Genesis. 'Rev A' likely refers to a revision of the original game's ROM, potentially including bug fixes or minor alterations.  The game's original release by Sega in 1992 is widely celebrated as a pinnacle of 16-bit platforming.  This version preserves the core gameplay of the original, emphasizing fast-paced platforming, speedrunning, and the iconic rivalry between Sonic and Dr. Robotnik.  The 'World' designation might signify a version of the game tailored for international release, but it may also be related to the ROM hacking community's conventions. The focus here is on playing the classic game without significant modifications.

Sonic the Hedgehog 2 (World) (Rev A)

Sonic the Hedgehog 2 (World) (Beta)