Unlimited lives:
Press 2 at the main menu to reconfigure the key commands. Then, press Y, G, R, O followed by 4 (Joystick). Then, press 1 to start game play.
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 20205,165
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 20205,165
POKE 54693,173
POKE 54995,173
Unlimited weapons:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 13031,0