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

POKE 11547,5
SYS 6713 
Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 13344,205
SYS 2061 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 40725,0
SYS 2061 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 14235,234
POKE 14236,234
SYS 2061 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 14235,173
SYS 2061 
Invincibility:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 14189,169
POKE 14190,0
SYS 2061 
Unlimited bombs:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 14181,0
SYS 2061