Hard Hat Mack

Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 16877,173

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 8472,100

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 16887,173