I was playing Ms. Pac-Man Plug N' Play and found the hardware test mode. Press and hold up on the joystick, while holding up press and hold fire, while holding fire press and hold down on the joystick, now you are in debug mode. I got to the sound test and there are files for the original Pac-Man which is interesting. There's actually alot of secrets in debug mode for such a simple console. I find exploring its nooks and crannies more fun than Xevious. I feel like an adventurer whom discovered an ancient city amongst the ruins.