Trick codes
Pause during the game and introduce this code: up, down, up, down. If you have done it correctly, a message will appear saying “Enter trick code”. From here, enter the code according to the effect you want.
| Code | Effect |
| Right, left, right, down, up, right | The aim of the enemy decreases. |
| Right, left, right, down, up, right | Extra armor. |
| Above, right, left, down, up, up | Invincibility. |