Sonic Robo Blast 2

Sonic Robo Blast 2 is a fan made, free Sonic-themed game using an advanced and massively modified version of the Doom engine, based on Doom Legacy. So far only a demo version of the game has been released. Version 1.09.4 is the current demo, while an exclusive beta of 1.09.5 has been released on the IRC chatroom.

External link

 * srb2.org