X-Men: Legends Cheats

Collect all 19 Sketchbooks to unlock the artwork in Colossus' room.

If you find yourself with more danger room discs than missions, then try
this.  Go to healers den and purchase the missing qualifying exam to
advance.  Other programs are also available there.  After purchasing
them, your only problem should be beating the challenge.

Choose Wolverine (at a high level) and run behind the Sentinel. Choose the Brutal Slash attack (Black + A) and repeat it until the Sentinel falls.

To Unlock the Xtreme Costumes:

On the main menu enter UP, UP, RIGHT, LEFT, DOWN, DOWN, START

When you're on the Character Select Screen, Highlight a character and then press X to change into their Xtreme Costumes.

The “Leadership” quality possessed by Storm and Cyclops can be a tremendous asset to the team. This skill multiplies both damage and experience when successfully completing a combo. At its highest level Leadership will multiply damage by 150% and experience by 25%. Use Storm and Cyclops together to multiply these values a second time. That’s 625 damage of a base 100 attack. With a good roll of the die, combo attacks upwards of 1500 are possible by the end of the game.