Dig Dug II: Trouble in Paradise - NES Manual

It is Dig Dug's job to protect 72 different tropical islands from his arch rivals, Pooka and the fire breathing Fygar. Played from an overhead point of view, Dig Dug now has two weapons at his disposal; the first is an air pump and the second is a drill. The pump can be used to inflate and destroy the enemies the same as in the original Dig Dug. At various locations on the islands are stakes, and when the drill is used near a stake a crack will form. If enough cracks become connected that section of the island will fall into the ocean, hopefully taking an enemy (and not Dig Dug!) with it. When all of the Pookas and Fygars have been destroyed, the game moves on to the next, more difficult level.