Unlimited energy:
Enter PABLO as a name at the high score screen while holding [Ctrl] when typing the letter "P".
Unlimited credits:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 1584,173
Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 14473,96