Galaga

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

POKE 17388,173

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

POKE 17388,165

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

POKE 17383,173
POKE 17388,173

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

POKE 12856,173