The following location must be found to enable cheat mode. After the game begins, move to the right until reaching a location with a teddy bear. Then, face the wall and press Circle to jump in that direction. If done correctly, you will hear a muted sound. Now move forward and walk in the next room just to the right of this location, which leads down into a small room. Press Circle to access a platform. Use this platform to reach a playroom and activate cheat mode. The following codes may now be enabled:

Invincibility

While playing a game, press X(4), Triangle, Circle, X, Square on controller two.

All weapons

While playing a game, press Circle(3), Triangle(2), X(2), Square on controller two.

Level select

While playing a game, press Triangle(3), Square(3), X(2), Circle on controller two.

Note: While playing a game, press R2 + Select to enable a mission select option.