Xerons

Invincibility:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 2273,238

Invincibility (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 2273,234
POKE 2274,234
POKE 2275,234

Invincibility (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 2574,255

Invincibility (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 2273,173

Invincibility (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 4782,238