Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 25903,234
POKE 25904,234
SYS 12288
Invincibility during level 1:
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 22603,234
POKE 22604,169
POKE 22605,0
SYS 12288