Master Cheat Unlock
Go to the main menu and HOLD L and press Right, Right, left, Left, Down, Up, B.
Beat Arcade Mode with Gambit.
Beat Arcade Mode with Bishop.
Unlock Dark Phoenix
Beat Arcade mode with Phoenix.
Unlock New Costumes
Beat Arcade Mode with any mutant to unlock third costumes for all characters.
Beat Arcade mode with Betsy.
Finish Story Mode using Magneto without losing any matches. You should fight Bastion. Defeat him to unlock him keep in mind you only have one chance if lose you will have to do the whole story over
Get Sentinel A
Beat Arcade Mode using Cyclops
Get Character's 3rd Costume
Beat Story mode using any character
Get Character's 6th Costume
Beat 10 characters in time attack mode using any character in under 15 minutes
Get Character's 7th Costume
Use team mode and fight with 8 characters. Defeat the entire opponent team by only using 2 or more of your characters to unlock the 7th costume for the characters you used
Wolverine gets his original yellow/blue/black costume.Phoenix gets a red/gold costume similar to Dark Phoenix.Juggernaut, Gambit, and Psylocke get a costume similar to their comic book original.
Beast gets a blue costume with a yellow X on his chest, and he also has a helmet.
Various End Sequences
Using story mode can result in these different endings
Magneto Victory Ending - Defeat Bastion using Magneto
Phoenix Victory Ending - If you lose the Magneto vs Bastion fight you can fight Phoenix vs Bastion
Secret Ending - Get a PERFECT victory in the Phoenix vs Bastion fight and you will unlock Dark Phoenix