X-Men: The Official Game

At the Cerebro Files Menu Screen, enter UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT.

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.

You can unlock eight danger room missions. You must get all the Sentinel files and Weapon X files with all the character.

Go to Cerebro and enter DOWN,DOWN,UP,UP,RIGHT,LEFT,RIGHT,LEFT