Quickly press A, B, A(2), B(3), A(2), C(3) at the title screen.
Contributed By: DarknessofFate.
Enter these codes while the game is paused.
Effect Code Both players invincible C, A, left, right, A, B Full energy for both players down, B, up, B, B, A Get upgraded weapons for both players C, right, A, B, B, up One life added for both players right, A, down, C, A, right Play Level menu down, B, A, C, down, right
Contributed By: FFCrono.
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