Invincibility:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 9100,205 
Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 39273,234
POKE 39274,234 
Cheat mode:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 7863,0