|Get a letter grade in every level (except Encores) in Normal Co-op Story Mode.|
The levels in Co-op are for the most part very similar to their single player counterpart but with either added obstacles that require co-op to overcome, or the puzzles are modified to require two players to complete them. It is possible to matchmake with random players online, it is possible to complete levels with different partners, once all the required levels have a letter grade it should unlock. Use the Achievement Trading Thread to find people to play with online.
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