Cheat mode
Enter the options screen and select "Cheat Codes". Then, enter one of the following codes to activate the corresponding cheat function.
| Master code | big fat cheater |
| Unlimited ammunition for any power-up you buy | endless supply |
| More firepower, fast auto-fire for every weapon | triggerhappy |
| Display accuracy | bullseye |
| Power-ups cost nothing | credit check |
| Start with 99 ships | starfleet |
| Level select | jump to level <number> |
| Practice bonus rounds | target practice |
| All enemies are snipers, extra hard mode | sitting duck |
| Space Invaders style, stick to one level | back to the roots |
| No cash, invaders do not drop coins | keep the change |