Cheat mode:
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At the main menu, hold L, then press Right(2), Left(2), Down, Up, B to unlock
everything in the game. If you entered the code correctly, a message will be
spoken.

Play as Bastion:
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Successfully complete story mode with Magneto without losing any matches to face
Bastion. Defeat Bastion to unlock him as a selectable character.

Play as Bishop:
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Successfully complete arcade mode with Gambit to unlock Bishop as a selectable
character.

Play as Blob:
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Successfully complete arcade mode with Bishop to unlock Blob as a selectable
character.

Play as Dark Phoenix:
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Successfully complete arcade mode with Phoenix to unlock Dark Phoenix as a
selectable character.

Play as Psylocke:
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Successfully complete arcade mode with Betsy to unlock Psylocke as a selectable
character.

Play as Sentinel A:
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Successfully complete arcade mode with Cyclops to unlock Sentinel A as a
selectable character.

Play as Sentinel B:
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Win twenty matches in survival mode to unlock Sentinel B as a selectable
character.

Third costume:
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Successfully complete story mode with any character to unlock their third
costume.

Fourth costume:
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Win twenty matches in survival mode with any character to unlock their fourth
costume.

Fifth costume:
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Successfully complete arcade mode on the hard difficulty setting with any
character to unlock their fifth costume.