Gun:
Press [Shift Lock] during game play on level 1. Press G to obtain a gun. 

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

POKE 45100,189 
Unlimited energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 45016,173 
Unlimited time:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 44086,96 
Gun mode:
Press [Shift Lock] + G during game play on the first floor to obtain a gun for use just on this level. Note: This will not work when the game is played on an Commodore 64S. 

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

POKE 39613,189
SYS 32768 
Invincibility (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 4566,176
SYS 32768 
Set number of lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program. Note: X represents the desired number of lives. 

POKE 34142,X
SYS 32768 
Set number of lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program. Note: X represents the desired number of lives. 

POKE 34147,X
SYS 32768