Cheat mode:

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

POKE 59626,189 

Cheat mode (alternate):

Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 19287,47

POKE 19288,0

SYS 13312 

Invincibility:

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

POKE 15489,48