This page contains Onslaught Unlockables for Xbox 360 called "Ultra difficulty" and has been posted or updated on Feb 20, 2009 by Zharlah. Let us know what you think of this Unlockable by thumbs voting.
- Developer: Stainless
- Publisher: Microsoft Game Studios
- Genre: Action Platformer 2D
- Release Date: Jan 21, 2009
- ESRB: Not Set
Finish the game on Expert difficulty.
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