| Effect |
Code |
| Arcade mode |
Enter sound test option and play the following songs (in order): 7, 7, 7, 7, 9, 3, 10. |
| Fast mode |
Enter sound test option and play the following songs (in order): 7, 5, 8, 4, 1, 10, 5, 1, 10, 5, 1, 8.
|
| Maximum HP |
Enter sound test option and play the following songs (in order): 3, 7, 3, 5, 1, 8, 2, 1, 9, 8, 4. |
| Nine credits |
Enter sound test option and play the following songs (in order): 0, 3, 3, 8, 3, 9, 0, 0, 8, 0.
|
| Slow mode |
Enter sound test option and play the following songs (in order): 0, 0, 0, 0, 0. |
| Start at second half of game |
Enter sound test option and play the following songs (in order): 1, 6, 0, 10, 5, 2, 10, 3, 8. Game play will begin after powering up with heavy artillery and speed.
|
| Unlimited ammunition |
Pause game play and press II, Left, II, Up, I, Right, I. |
| Unlimited bombs |
Pause game play and press I, II, Left, I, II, Up, I, Down, I, II, Select, Up, Down. |
| Unlimited credits |
Enter sound test option and play the following songs (in order): 3, 4, 3, 8, 0, 1, 4, 1, 14, 14. |
|
