Loderunner

Invincibility:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 7892,255

Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 2710,44

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 7636,X