Sabre Wulf

Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 45219,173
SYS 2061

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 45219,173
SYS 3328

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 45219,173
POKE 45220,173
SYS 2061

Set number of lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
Note: X represents the desired number of lives.
POKE 3203,X