Gyruss

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

POKE 3999,20

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

POKE 3999,200

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

POKE 9024,100

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

POKE 9041,100

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

POKE 4491,99