In the game, you control a character walking around with a metal detector. When an object is found, the area will be highlighted and the beeps will become more frequent. By watching an ad, you can highlight all the beeps in the visible area by pressing the button in the upper left. Click on the find location and dig it up. The item you find will appear in the finds menu in the upper right corner. You can sell the item for coins and use them to upgrade your metal detector, or you can add it to your collection.