Throughout the game you can either pause it (by pressing START) for menu options or you can go into your journal (by pressing BACK). Once you are in the journal, you can enter the cheat codes. The directions are done on the D-pad.

• Big Weapon Mode: LEFT, X, X, X, Y, Y, Y
• Spell Soul Energy: LEFT, RIGHT, RIGHT, LEFT, LEFT, RIGHT, RIGHT, LEFT, Y, Y
• Big Demon Heads: BLACK, LEFT, RIGHT, LEFT, LEFT, RIGHT, LEFT, BLACK
• Rapid Fire Shotgun: WHITE, LEFT, BLACK, LEFT, Y, X, Y, X
• Explosive Holy Bombs: RIGHT, LEFT, X, Y, X,Y, LEFT, RIGHT
• Shoot Large Fireballs: Y, Y, Y, LEFT, RIGHT, RIGHT, LEFT, LEFT, RIGHT
• Infinite Ammo: LEFT, RIGHT, LEFT, X, Y, X, X, Y, Y, X, Y, X, X, Y, Y

At the end of level 7 (Journey To Papa Midnights) Constantine goes into a warehouse with four colored lights on the floor. Use "True Sight" to work out the combination needed to transport out. The following is the correct combination: Y Y B A A A X X