Undertow
released on Dec 21, 2007
Undertow is a side-scrolling game featuring multiplayer combat, as well as a 15 level singleplayer campaign that takes you through a war involving the Atlanteans, mysterious aliens, and what's left of humanity.
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I remember there was a brief period of time where everybody had this game because it was the first game Xbox ever made free on their store. I don't remember much in terms of the specifics of how it played, but I remember the online multiplayer being pretty fun with how many people were on it. Probably not worth picking up on the single player alone, but an enjoyable experience while it lasted.