At the title screen, press Right four times, Up three times, Left six times, Button 2 seven times and Button 1. If done right, the debug menu will appear right away.
After beating the game, at the "The End" screen, press Button II 62 times and then Button I once. If done right, you'll go to a scene where you'll listen to some radio drama.
Start With 99 Levels
You need a second controller for this to work. At the PC Engine CD boot screen, hold Up + Button 1 + Button 2 on controller 2 and press Start on controller 1. The game will start automatically and you'll have 99 levels.
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