X-Men: Next Dimension

Unlock Everything:
Press Up, Up, Down, Down, Left, Right, Left, Right, A, B, Start and Start at the main menu to unlock everything.

Unlock Bishop:
Complete Arcade Mode with Gambit to unlock Bishop.

Unlock Blob:
Complete Arcade Mode with Bishop to unlock Blob.

Unlock Dark Phoenix:
Complete Arcade Mode with Phoenix to unlock Dark Phoenix.

Unlock Psylocke:
Complete Arcade Mode with Betsy to unlock Psylocke.