I recently picked up a dev xbox and this game was on it. I haven't been able to find anything about this game. Just try searching Sonic Extreme... it bring up a bunch of hits for Sonic Xtreme. Anyways from what I have played (mission 1 and some player battles) the game was playable- still gotta see how complete. Just wondering if anyone knew anything about it? Here is a short video: http://www.youtube.com/watch?v=XKgSOqS2g1I There is sound, I just had it turned off and if i was using two hands, Sonic can do other moves. Edit: Another Video http://www.youtube.com/watch?v=nAy0JE0-YFM Combat Part of the Game: http://www.youtube.com/watch?v=zjWwYMb_AgM More info: I played through all parts of the game. The goal of the missions is to get a key and then open a lock. That ends the misson. I could swear the first time I played it i got to at least misson level 2 and then a 3... but it has been freezing up or sending me back to the game screen when i get the lock... maybe im missing something. Then the combat is a small area with 4 sub-zones. There are 4 keys, 1 for each zone. There are grenades, firecrackers, homing rockets and mines that can be picked up and used against the other player or to destory crates. Also pressing the R and L triggers at the same time moves both players back to the middle of the level- not effecting key earned or boxes destoryed. I couldn't figure out a way to win/lose/leave without quitting. Then there is the race level. It feels a lot like Sonic Adventure 2 battle- the first level. You go around a seemingly neverending track, then when you finish it boots you to the game screen.