GoDai - Elemental Force

Select stage
Press L1, L2, X, Triangle, L1, L2, X, Triangle in the main menu.

UNlock multiplayer characters:
press R2, Circle, X, Square, Triangle, Right, Down, Left, Up, L2, L1,
Circle, Square, L1, L2, L1, Circle, L2, Square in the main menu.

Unlock all magic
Start a single player game, after pause the gameplay, then - press
R1, R2, L1, L2, X, Triangle, Circle, Square.

God mode:
Start a single player game, after pause the gameplay, then
press L1, L2, Circle, Square, L1, L2, Circle, Square.

Onehit kill:
Start a single player game, after pause the gameplay, then press
L1, L2, Left Analog-stick Up, Left Analog-stick Down, Left
Analog-stick Left, Left Analog-stick Right, Triangle, Square,
X, Circle.