Cheat mode:
Press [Esc] to display the main menu. Then, enter one of
the following codes to activate the corresponding cheat
function. A sound will confirm correct code entry.
Press [Esc] again to resume game play.

Power and shields - ahcrp
New item for hypercycle - ahcre
500 photon, neutron and darts - ahcrw
Gateways immediately open - ahcro
Level select - ahcrg(01-30)