Cheat mode
Press [F10] at the high score screen to enable cheat mode. The text "High Scores" will change to "Firm Help" to confirm correct code entry. Press one of the following keys during game play to activate the corresponding cheat function.
| Effect | Key |
| Health and ammo | [F7] |
| Level skip | [F8] |
| Invincibility | [F9] |
