X-Men: The Official Game Cheats Danger Room Unlocks
At the Cerebro Files menu, input the associated code to unlock stuff.
Nightcrawler Danger Room - UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, START.
Wolverine Danger Room - DOWN, DOWN, UP, UP, RIGHT, LEFT, RIGHT, LEFT, START.
Iceman Danger Room - RIGHT, RIGHT, LEFT, LEFT, DOWN, UP, DOWN, UP, START.