Self-check: Type checkdisk at the title screen to scan the
program disk for errors.
Cheat mode: Hold Z + X + C + U + I
+ O (in that order) during game play to enable cheat mode.
The screen will flash to confirm correct code entry. Press one
of the following keys to activate the corresponding cheat function.
Note: Press Up or Right on the cursor keys to increase
values or Down or Left to decrease values.
