A Sonic 2 hack made by MainMemoryThis hack adds the Drop Dash from Sonic Mania into Sonic 2 for the Sega Mega Drive. While playing as Sonic, you can perform a Drop Dash by jumping, then pressing and holding a jump button until you touch the ground.

The Homing attack/jumpdash in Sonic 2 proof of concept hack is a hack which adds the homing attack to Sonic's arsenal of moves in Sonic the Hedgehog 2. The Homing attack is a move which is performed in mid-air to zoom into Badniks and objects with a high speed attack. In addition, trailing images appear when the player reaches top speed. It was created primarily by Hitaxas but with assistance by shobiz.

Not-so-Super Sonic 2 is a hack of Sonic the Hedgehog 2 by MainMemory. It was first posted in the Random Hack/Mini Project thread, where nobody paid any attention to it. MainMemory said himself that updates would be unlikely, but has changed his mind.

A hack based on Sonic the hedgehog 2 made by snkenjoi Aperture Science's Portal Gun finds its way into Sonic 2.The portals in the game actually affect objects other than sonic - to the extent that you can kill an enemy with its own projectile if you fling it back at it.Credits:E-122-Psi - sonic's spritesheetflamewing - help with collision detectioniojnekns - portal spritesFraGag - testing

Referred to in-game as Knuckles the Echidna in Sonic the Hedgehog 2, the game is largely identical to Sonic the Hedgehog 2, with the exception that gameplay is altered due to Knuckles having separate abilities from Sonic or Tails. Knuckles can glide and climb walls, allowing him to gain access to areas that had been otherwise hidden or unreachable. Conversely, he cannot jump as high, making some situations, such as certain boss fights, especially the final one, more difficult. In this version of the game, the two player mode has been removed.

Yoshi in Sonic The Hedgehog 2 (by Xenowhirl), made based on the games Sonic the Hedgehog 2 and Yoshi's Island.The game brings several modifications, including new enemies and adaptations in the phases.