A longplay for Sonic 2 hack is Sally Acorn in Sonic the Hedgehog 2.

Sally Acorn in Sonic the Hedgehog 2 (aka Sally in Sonic 2) is a fan-made ROM of the game Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis, with Princess Sally Acorn as a playable character in place of Sonic the Hedgehog

The game was modified by Sonic Retro member E-122-Psi, with additional programming and coding by other members including MainMemory, Qiuu and Snkenjoi.