Dunk is a dwarf treasure hunter who got separated from his crew by a cave-in and is now on his own beneath the earth. The core of the game is drilling — players hold the trigger to rev up Dunk's drill and bore through dirt and stone in any direction, creating persistent tunnels that remain exactly as dug between sessions. Digging drains Dunk's stamina, which a supply of his favorite drink, "beev," helps restore. Scattered underground are sealed tombs full of treasures and monsters; Dunk defends himself with a hammer and brings valuables back to surface settlements to sell, using the proceeds to fund his next expedition.