Level skip:
Type GOATS or COATS at the title screen or during game play. Then, press [Space] to advance to the next level. 

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

POKE 39707,96 
Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 2599,230 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 2476,230 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 39931,238 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 35518,250 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 35517,95 
Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 39768,44
POKE 39931,238
POKE 2599,230
POKE 2746,230