Cheat mode:
Use the joystick to move the cursor to the top left corner of the
cargo/energy screen. Press [Keypad Plus] + Fire to enable cheat mode The
screen will flash to confirm correct code entry. Unlimited shields and
lives will be available while cheat mode is active. Press one of the
following keys to activate the corresponding cheat function.
Effect Key
Disable enemies [F1]
Full energy [F6]
Various weapons 0 - 9
Jump to end of game:
Enable cheat mode, then select the outermost planet.