X-men: Next Dimension

Chest Mode
At the main menu, hold [l], then press Right(2), Left(2), Down, Up, [b] to unlock everything in the game. If you entered the code correctly, a message will be spoken.

Play as Bastion
Successfully complete story mode with Magneto without losing any matches to face Bastion. Defeat Bastion to unlock him as a selectable character.

Play as Bishop
Successfully complete arcade mode with Gambit to unlock Bishop as a selectable character.

Play as Blob
Successfully complete arcade mode with Bishop to unlock Blob as a selectable character.

Play as Dark Phoenix
Successfully complete arcade mode with Phoenix to unlock Dark Phoenix as a selectable character.

Play as Psylocke
Successfully complete arcade mode with Betsy to unlock Psylocke as a selectable character.

Play as Sentinel A
Successfully complete arcade mode with Cyclops to unlock Sentinel A as a selectable character.

Play as Sentinel B
Win twenty matches in survival mode to unlock Sentinel B as a selectable character.

Third Costume
Successfully complete story mode with any character to unlock their third costume.

Fourth Costume
Win twenty matches in survival mode with any character to unlock their fourth costume.

Fifth Costume
Successfully complete arcade mode on the hard difficulty setting with any character to unlock their fifth costume.

Sixth Costume
Defeat all ten fighters in time attack mode in under fifteen minutes to unlock the sixth costume for the fighter you selected.

Seventh Costume
Select team mode and choose to fight with eight characters. Defeat all of the your opponent’s team by using two or less of your own fighters to unlock the seventh costume for the character(s) you used.

Eighth Costume
Win forty matches in survival mode with any character to unlock their eighth costume.

Ending Sequences
There are three possible endings in the game in story mode:

Regular ending (Magneto’s Victory): Defeat Bastion with Magneto.

Alternate ending (Phoenix’s Victory): Lose the Magneto vs. Bastion fight and you will go to the Phoenix vs. Bastion fight. Defeat Bastion with Phoenix.

Secret Ending (Fury of Dark Phoenix): Get a “Perfect” victory in the Phoenix vs. Bastion fight. This will also unlock Dark Phoenix as a playable character.