Master Cheat Mode

Go to the main menu and HOLD L and press Right, Right, Left, Left, Down, Up, B. This unlocks EVERYTHING!

Get Slow Deaths

Go to the main menu and press Up, Up, Down, Down, X, Y, Y, X, Up, Up, Down, Down, X, Y, Y, X

Toggle Infinite Supers

Go to the main menu and press Up, Up, Down, Down, A, X, A, X

Toggle AI

Go to the main menu and press Up, Up, Down, Down, A, A, B, B, X, X, Y, Y

Get Dark Phoenix

Beat Arcade Mode using Phoenix

Get Bishop

Beat Arcade Mode using Gambit

Get Psylocke

Beat Arcade Mode using Betsy

Get Bastion

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 Bishop

Beat Arcade Mode using Gambit

Get Blob

Beat Arcade Mode using Bishop

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

Rocket launcher

up,down,right,x,z
Submitted by robert

SUPER HEALTH

if you beat the mode arcade using all persons you will get the master of all onslaught and Mega Bastion
Submitted by LINDORVINI