Sentinel

Unlimited energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 8522,173

Unlimited energy (alternate):
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 6679,173
POKE 8512,10
SYS 16128

Sentinel does not drain energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 6679,173

Cheat mode:
Load or reset the game, then execute the following BASIC commands before running or restarting the program.
POKE 6679,173
POKE 7512,10
SYS 16128