GC SET files - Object layouts from the GameCube version of SADX, with more background objects than the PC version.
Note: Some hacks which were listed here previously have been converted for use with the SA2 Mod Loader, and are now available on the SA2 Mods page.
Alternate Character hack - Loads the alternate characters in 1P mode.
Dreamcast Models - Character models and textures from the Dreamcast version, converted for the PC port.
Character Select hack - Allows you to load the character of the opposite aligment by holding L, and the 2P alternate by holding R.
Sonic 2 Hacks
Not-so-Super Sonic 2 - A hack with stuff, including Amy Rose. Currently not being worked on.
S2Boost - A Sonic Rush style boost in Sonic 2.