Sonic 2: Lose Tails Or Else is a ROM hack of Sonic the Hedgehog 2 for the Sega Genesis, likely created within the ROM hacking community. The original Sonic 2, released by Sega in 1992, was a highly influential platformer. This hack modifies the game, and the title suggests the gameplay might involve a penalty or consequence for losing Tails, Sonic's sidekick. The specific modifications are likely not well-documented, but it's presumed to alter the core gameplay mechanics of the original. It would still retain the 2D platforming, speed-based challenges, and core elements of Sonic 2 but change how Tails integrates with the game world or penalties the player incurs for losing Tails.

Sonic 2: Lose Tails Or Else