X-Men - Next Dimension cheats and cheat codes for XBox

Enable cheat mode
Go to the main menu, then hold L, after press 
Right, Right, Left, Left, Down, Up, B on your controller.

Note: 
Before activate the cheat mode, remove all of the memory cards from slot.
After you entered the code reinsert the memory card and save the game.

3rd outfit
Finish story mode with any character

4th outfit
Beat 20 matches in survival mode with any character

5th outfit
Finish arcade mode in hard mode with any character

6th outfit
Beat all 10 fighters in time attack mode less than 15 minutes

Unlock Bishop
Finish arcade mode with Gambit to play as Bishop.

Unlock Blob
Finish arcade mode with Bishop to play as Blob.

Unlock Dark Phoenix
Finish arcade mode with Phoenix to play as Dark Phoenix.

Unlock Psylocke
Finish arcade mode with Betsy to play as Psylocke.

Unlock Sentinel A
Finish arcade mode with Cyclops to play as Sentinel A. 

Unlock Sentinel B
Win twenty matches in survival mode to play as Sentinel B.

Unlock Bastion
Finish story mode with Magneto without losing a single matches, then 
defeat Bastion

Endings:
There are 3 possible endings in story mode:

Regular ending: Beat Bastion with Magneto.

Different ending: If you lose the Magneto vs. Bastion fight, you can fight
with Phonix against Bastion. Beat Bastion with Phoenix.

Hidden Ending: Reach "Perfect" victory in the Phoenix vs. Bastion battle.
This will also unlock Dark Phoenix also.