In Mr. Driller, your objective is to drill through stacked colored blocks to the bottom of each level as quickly as you can. Like-colored blocks will bond together and, depending on the path you burrow, will prevent other blocks from falling on your head. Find the air bubbles to keep you alive while you drill for a higher score. You'll also find tanks of air down there, but be careful going after them--you could end up squashed by the blocks above.