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

POKE 3310,255 
Faster speed:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 18316,0 
Constant speed:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 18605,165 
Opponents stopped:
Load or reset the game, then execute the following BASIC command before running or restarting the program. 

POKE 20005,181