Sonic the Hedgehog XA is an open-source fan-game inspired by classic Sonic games from the Sega Genesis. It was built from scratch by a single person using the C language and PSn00bSDK and a lot of tools and scripts created for the sole purpose of building this game. Sonic XA is a game that runs on the PlayStation 1, so to play it, you will need to use an emulator or burn the game to a proper CD-ROM so you can play it on your home console.
Sonic the Hedgehog: Project Mettrix is a fan game led by Stealth, created using his own E02 Headcannon Game Engine. This platform makes this game available to DOS, Windows, Linux, MacOSX, PSP (CFW), and Wii (Homebrew Channel) users, and has allowed a significant amount of mechanical evolution from the game's earlier incarnations.
Platform / Adventure / Indie / Action / Science fiction
Sonic Robo Blast 2, abbreviated as SRB2, is a fan game for Windows and DOS platforms. It is a 3D platformer developed by a group called Sonic Team Junior, using a modified version of the Doom Legacy source port of Doom, to allow for such things as optional analog control and true room-over-room (something not possible in the standard Doom engine), as well as the standard gameplay elements Sonic games are known for. It has been in the works since 1998 and is currently nearing completion, though several parts of the game are still missing. Sonic Robo Blast 2 is closely inspired by the original 2D Sonic games for the Genesis and attempts to recreate a game with this style in 3D, though it also borrows elements from the current Sonic games, such as Sonic's signature Air Spin Attack. Entirely original to SRB2 is its Multiplayer mode, a variation of classic first-person shooter games with Sonic elements. Due to being built with a modified Doom Legacy engine, the game is also very easily customizable. Custom levels, characters and even source code modifications can be created with the help of external editors.
New Super Mario Land is a recreation of Super Mario Land (Game Boy) using New Super Mario Bros. (Nintendo DS) assets and released for the SNES, with pseudo-3D graphics and a new co-op multiplayer mode.
Super Mario 64: Star Revenge is rom hack/mod of Super Mario 64 by BroDute. It is the first game of the Star Revenge series of hacks.
The New Adventures of Sonic the Hedgehog is a fangame based on Sonic Cartoons & Archie Comics. The Game itself takes place in a special Alternate Universe where elements of all three shows (SatAM, AoStH & Underground) co-exist in some kind of fashion. You have a choice to play through 3 zones in this demo; Peridot Coast (a beach in Mobius best known for it's unusual green sand), Marble Valley (a canyon filled with volcanic geysers) & Robotropolis (an industrial city & Primary headquarters of Bumbling villain Dr. Robotnik & his Super Sonic Search & Smash Squad!
NEW! SMW2 Yoshi's Island is a more-than-full Yoshi's Island Hack. The story basically is the same like in the original game, but it includes 60 brand-new levels, custom icons and maps and added Yoshi colors for Extra- and Secret levels.
