The included documentation with this game goes into great detail about how to use the level editor, but omits discussing the actual game itself… which is unfortunate, as it's a bit confusing. You move your little mole guy with the arrow keys, and dig with space or return. To solve a level, you need to find three items (the first of which marks the other two) and leave through the entrance you started next to.

Also, hit "Y" at the text prompt before the game starts up, otherwise it just exits.