Help Diggy dig to the center of the earth and find the wandering truffle. Use your mouse to aim Diggy's drill, and click to drill in that direction. Press E to activate Diggy's radar and locate hidden objects, then drill to them and pick them up. When Diggy runs out of energy, use the money you've earned to buy upgrades to Diggy's equipment. Look at the costs and benefits for each upgrade, and buy them strategically. How long will it take you to reach the center?