Cheat mode:

Pause game play at the indicated level and enter one of the codes for the corresponding effect.

Current level | Effect       |          Code 

   1               Unlimited lives        MARTY MCFLY 

   2               Advance to level 3  MOM, IS THAT YOU 

   3               Unlimited lives        TOM LOVES THERESA 

   4               Advance to level 5  OUTATIME 

   5               Unlimited lives        BACK TO THE FUTURE 3 

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Unlimited lives:

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

POKE 17966,173