Thrill Digger is a mini-game from The Legend of Zelda: Skyward Sword. It is a Minesweeper-esque game where Link has to unearth Rupees and avoid Bomb Flowers. It is located inside a cave in Eldin Volcano known as the Thrill Digger area (according to Fi). There is a time limit to each game, but often it will be not met because there are a finite number of decisions to be considered. Nevertheless stalling will be met with a warning, and then the game will stop a minute later.