On the Game Start screen, a choice between a multiplayer mode and an AI mode is offered. The multiplayer mode supports three players simultaneously for the Digger and both Nobbins. In the AI mode, one player controls the Digger and the Nobbins are AI-controlled.
In this game, the Digger tunnels its way through an underground mine, in an attempt to consume all the emeralds to win. On the other hand, two non-tunneling Nobbins chase the Digger and attempt to catch it before all the emeralds are gone. Every now and then, a random emerald gains special markings which distinguish it from the others. If the Digger can consume that emerald before the markings disappear, the Digger gains a speed boost for a limited time.