Cheat mode:

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

POKE 14864,0 

Unlimited lives:

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

POKE 27201,108 

Unlimited lives (alternate):

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

POKE 7341,99 

Unlimited lives (alternate):

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

POKE 11485,125 

Unlimited lives (alternate):

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

POKE 11864,0