X-Men: The Official Game Cheats

X-Men: The Official Game Unlockable: Danger Rooms
You can unlock eight danger room missions. You must get all the Sentinel files and Weapon X files with all the character.

X-Men: The Official Game Cheats Danger Room Unlocks
Unverified. 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.

X-Men: The Official Game Unlockable: Wolverine's Danger Room
Go to Cerebro and enter DOWN,DOWN,UP,UP,RIGHT,LEFT,RIGHT,LEFT