Bagitman

Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 19013,189

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 22235,5

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 22236,255