Firetrap

Unlimited lives:
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 7500,234
POKE 7501,234
SYS 4096

Unlimited lives (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 7049,165
SYS 4096

Unlimited time:
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 11497,165
SYS 4096