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At the title screen, enter one of the following button combinations:

  • One-hit kills: Circle buttonL2 buttonDown dpadR1 buttonCross button
  • Infinite ammo: L1 buttonL2 buttonCross buttonR2 buttonR1 button
  • Unlock all bonus features: Left dpadR1 buttonL1 buttonDown dpadCircle button
  • Unlock all levels: R2 buttonRight dpadL2 buttonUp dpadSquare button
  • Invincibility: Up dpadSquare buttonCircle buttonCross buttonDown dpad
  • Explosive bullets: Cross buttonCircle buttonSquare buttonL2 buttonR1 button