Level select:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. Note: X represents a level number from 0 through 19. 

POKE 16424,X
SYS 16384 
Disable collision detection:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 16632,0
SYS 16384 
Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 16432,5
SYS 16640 
Set 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 ???. 

POKE 1624,X
SYS 16640 
Invincibility:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 16571,173
SYS 16640 
Cheat mode:
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 16573,234
POKE 16572,234
POKE 16571,234
SYS 16384 
Cheat mode (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program. 

POKE 16423,5
POKE 16571,173