Чит коды на Army Men: Operation Meltdown (PS/PS2)

Type in the following codes at the main menu screen:

Invisible player - R1, L1, X, Circle(x2), Square(x2), R1, Circle.
Unlock all weapons - X(x2), Triangle, Circle, UP(x2), DOWN, Square, Triangle.
Level select - R1+R2, L1+L2, Circle, Square.
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