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Ooh, are we tearing the OP's argument to shreads? can I join in?

Paper mario has the first claim to a 2.5 D platformer (well, maybe not first, but certainly before LBP)

Sonic 2 is only 2 player co-op but still good

The lost Vikings 1 and 2 are both 3 player co-op, and are some of the most incredible gaems ever