X-Men: The Official Game - Code Effect

Code - Effect:
Right, Right, Left, Left, Down, Up, Down, Up, Start - Training mission for Iceman.
Up, Up, Down, Down, Left, Right, Left, Right, Start - Training mission for Nightcrawler.
Down, Down, Up, Up, Right, Left, Right, Left, Start - Training mission for Wolverine.

Comic Alternate Costume:
Collect all Sentinal Techs with a character to unlock his or her alternate comic costume.

Street Alternate Costume:
Collect all Weapon X files with a character to unlock his or her alternate street costume.

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.