First go to the main menu, and then click on cheats allowed/on. Then play the game and press:
Code Effect F5 Health F6 Missles F8 Next wave F7 Power ups
Contributed By: Driafter.
Know Something We Don't?
You can submit new cheats for this game and help our users gain an edge.
Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.