Future Knight

Unlimited lives:
Hold B + U + G + 8 + 7 at the title screen.
The screen border will turn gray and the "Future Knight" logo will change to "Future Cheats" to confirm correct code entry.
Note: No points can be scored while this cheat is enabled.

Cheat mode:
Type 479EUJM.

Cheat mode (alternate):
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 13046,173

Unlimited lives:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 12783,173

Unlimited energy:
Load or reset the game, then execute the following BASIC command before running or restarting the program.
POKE 13040,0