Cheat mode:
Type fifthdimension at the main menu, then press one of the following keys during game play to activate the corresponding cheat function.

Effect	Key
Disable active codes	[F1]
Big paddle	[F2]
Single gun	[F3]
Double gun	[F4]
Missile gun	[F5]
Laser	[F6]
Level skip	[F7]
Suicide	[F8]
Protective beam	[F9]