:: video games cheat and cheat codes ::                                            

XBox - X-Men: The Official Game cheats

Unlock Danger Rooms:

Iceman Danger Room missions:
Enter it at the Cerebro Files menu, and press the following buttons 
on your controller: Right, Right, Left, Left, Down, Up, Down, Up, Start

Nightcrawler Danger Room missions:
Enter it at the Cerebro Files menu, and press the following buttons on 
your controller: Up, Up, Down, Down, Left, Right, Left, Right, Start 

Wolverine Danger Room missions:
Enter it at the Cerebro Files menu, and press the following buttons on 
your controller: Down, Down, Up, Up, Right, Left, Right, Left, Start  

Unlock costumes
Get all Weapon X files with a playing character
Get all Sentinal Techs with a playing character

Another six Danger Rooms.
Accumulate all Sentinel files and Weapon X files with each character