While battling, press the "Up" button twice rapidly. By doing this, you can glide with your character for a short distance.
NB: If you get damaged while gliding, you will fall. Also, you can only use this strategy with Storm, Phoenix, Magneto and Rogue.
At the Title Screen press:
Select, Down, R2, L1, R1, L2
All features, including alternate costumes, outro FMV sequences, behind the scenes movie pictures, the Pool Party, and characters: Psylocke, Juggernaut, Spider-Man, and Professor X will be unlocked. To use Spider-Man, highlight Cyclops and hold L1 at the character selection screen. To use Professor X, highlight Magneto and hold L1 at the character selection screen.
How to earn the players instead of cheatin them:
Juggernaut: complete arcade mode using 2 default characters to unlock
Professor X: complete arcade mode with Juggernaut
Psylocke: complete arcade mode with Wolverine
Spider-Man: fight in Arcade Mode until you face Spider-Man. Defeat him and finish arcade mode. Then highlight Cyclops and hold L1 at the character selection screen
Juggernaut:Finish the game with Psylocke.
Psylocke:Finish the game with Wolverine.
Xavier(or Professor X):Finish the game with Juggernaut.After that,go to character selection screen,highlight Magneto,and hold L1.Press X to select him while holding L1*.
Spider-Man:Fight at Arcade Mode until you face with Spider-Man.After beating him,go to character selection screen,highlight Cyclops,and hold L1.Press X to select him while holding L1*.
*:You can look at them information from Cerebro by using this way.Also,you can't learn their moves by training,You must dicover their moves yourself.
Street:Finish the game with Juggernaut.
Pool Party:Finish the game with every character.When you battle at here,characters will appear in swimsuits.
Elevator: Finish the game with Psylocke.