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

POKE 7715,165 
Cheat mode (alternate):
Reset the game then restart with a SYS 2305 command. Reset the game again, then execute the following BASIC commands before restarting the program. 

POKE 2513,250
SYS2304 
Cheat mode (alternate):
Reset the game then restart with a SYS 2305 command. Reset the game again, then execute the following BASIC commands before restarting the program. 

POKE 2513,250
POKE 2527,173
SYS 2304