All magics unlocked:
Enter at the pause menu or during gameplay: 
R1, R2, L1, L2, X, TRIANGLE, CIRCLE, SQUARE. 

Level select:
Enter at the main menu or during gameplay: 
L1, L2, X, TRIANGLE, L1, L2, X, TRIANGLE. 
 
One-hit kills (Hiro) (only works in single player mode):
Enter at the pause menu or during gameplay: 
L1, L2, Left Analog UP, Left Analog DOWN, Left Analog LEFT,
Left Analog RIGHT, TRIANGLE, SQUARE, X, CIRCLE. 

Hiro invincible (only works in single player mode):
Enter at the pause menu or during gameplay: 
L1, L2, CIRCLE, SQUARE, L1, L2, CIRCLE, SQUARE. 
 
All multiplayer characters unlocked:
Enter at the main menu or during gameplay. 
R2, CIRCLE, X, SQUARE, TRIANGLE, RIGHT, DOWN, LEFT, UP, L2,
L1, CIRCLE, SQUARE, L1, L2, L1, CIRCLE, L2, SQUARE. 


by unknown