Load the game and wait until the high score screen
appears. Type commander and press Fire. Wait
approximately two seconds and press [F10] to enable
cheat mode. Your ship will flicker to confirm correct
code entry. During cheat mode, your ship will be
invincible, and have unlimited expansions and smart
bombs. Additionally, one of the following keys may
be pressed to activate the corresponding cheat function.

High score will not be recorded while cheat mode
is enabled.
Other six levels of expansion = [F1] - [F5]
Level skip = [F8]
Toggle cheat mode = [F10]