Halo

Microsoft, Xbox

The first-person shooter that launched thousands of Xboxes (and sold millions of copies) included one of the best co-op experiences in recent history. Two players could play through the single-player campaign together. The game didn't include online co-op, since it was released pre-Xbox Live, but that didn't stop thousands of guys convincing their girlfriends to play through the entire game in the spirit of spending "quality time" together.

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