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

POKE 2273,238 

Invincibility (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 2273,234
POKE 2274,234
POKE 2275,234 

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

POKE 2574,255 

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

POKE 2273,173 

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

POKE 4782,238