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'''Sonic Robo Blast 2''' (or SRB2 for short) is a fan made, free [[Wikipedia:Sonic the Hedgehog series|Sonic]]-themed game using an advanced and massively modified version of the [[Doom engine]], based on [[Doom Legacy]]. The game focuses on recreating the feel of the classic games, as opposed to the newer Sonic that Sega has been making games for now. So far, only a demo version of the game has been released. Version 1.09.4a is the current demo. The next version is to be released alongside Sage in Julyversion 2. It still isn't complete, as some acts of zones are missing.

Srb2 SRB2 supports numerous multiplayer modes, some of them sporting first-person gameplay, while others featuring more Sonic-like gameplay.

Srb2 SRB2 supports a Cooperative mode, in which many players can complete a level together. The levels proceed normally, and after one player completes the level, the stage ends.

Players either shoot rings at each other, or touch each other to pass on the "it" status, depending on whether Tails pickup ON or OFF. Characters who are not "it" lose their special jumping ability in order to give the person who is "it" a fair advantage. Points are earned if one player can avoid being tagged if the "it" status is given to another player.