X-Men Legends

Unlock classic costumes:
Finish the game once

Unlimited combo:
Start the combo by pushing X then A, A, X, X, then keep repeating
A, A, X, X, A, A, X, X, etc.

Change xtreme costumes:
Press Up, Up, Right, Left, Down, Down, Start in the main menu.
During game play, go to an Xtraction save location and
press the button next to "Skin".

Unlock Beast: Finish level 1.
Unlock Colossus: Finish the Nuclear Facility level.
Unlock Cyclops: Beat Mystique.
Unlock Emma Frost: Locate Emma Frost in X Mansion after the Nuclear Facility
Unlock Gambit: Finish level 3.
Unlock Ice Man: Finish level 1.
Unlock Jean Grey: Finish level 1.
Unlock Jubilee: Finish level 2.
Unlock Nightcrawler: Finish level 2.
Unlock Psylocke: Finish the NYC Riot/Muir Island/Sewer level.
Unlock Rogue: Finish level 1.
Unlock Storm: Finish level 1.
Colussus without metal, Colussus 90's: Beat the game.
Bobby Drake, Original Iceman: Beat the game.
Street Clothes Magma: Beat the game.
Wolverine 90's, Weapon X: Beat the game.
Storm's white outfit: - Beat the game.

Extra health and energy:
Fail at the Danger Room courses as many times as possible.
You will get health packs, energy packs, armor, etc.

Infinite life:
Go to main menu and press Up, Left, Down, Right