Enter the following codes at the Title Screen:
In story mode beat the game with Van Reily, John Bishous and Tenrou Ugetsu to get three secret characters.
Circle, R2, R1, Triangle, X, Square, Right, L2, L1, Up, Down, Left
L2, L1, Up, Left, Down, Right, Square, X, Circle, Triangle, R1, R2
R2, R1, Triangle, Circle, X, Square, Right, Down, Left, Up, L1, L2
Change traps L2, R2, L1, R1, Up, Triangle, Left, Right, Square, Circle, Down, X
Extra levels Select 12 times
Alternate Background Music:
At the title screen press Circle, R2, R1, Triangle, X, Square, Right, L2, L1, Up, Down, Left.
Secret Save Icon:
At the title screen press Left, L2, L1, Up, Down, Right, Square, R1, R1, Triangle, X, Circle.
HintsJust A Tip:
If you want to utterly destroy the enemy while having fun simply do this: Set the "Preset Trap" option to "on" and then Select either "vs com" or "vs man", select an agent. If the enemy makes a "giant" bomb (which is a detonator and a WHOLE LOT of bombs) Try to find a neutral mine. Make sure the blast area of the mine is big and then step on it and watch the enemy die a horrible death!
Thanks to Revolution readers minion_007, Alexander Lyngsnes and Fabbo Divine!