X-Men: The Official Game Cheat Codes

Unlock Danger Room Missions
There are eight danger room missions. You unlock the first three as you play through the game. To unlock the other six danger room missions, you must collect all Sentinel files and Weapon X files with each character.

Bonus Nightcrawler Danger Room level
Press Up, Up, Down, Down, Left, Right, Left, Right, Start at the Cerebro Files menu.

Bonus Iceman Danger Room level
Press Right, Right, Left, Left, Down, Up, Down, Up, Start at the Cerebro Files menu.

Bonus Wolverine Danger Room level
Press Down, Down, Up, Up, Right, Left, Right Left, Start at the Cerebro Files menu.