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

POKE 5578,0
SYS 4608 
Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 6757,96
SYS 4608 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

Poke 6757,173
SYS 4608 
Select number of lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. Note: X represents the desired number of lives. 

POKE 4704,X + 128
SYS 4608