Working on the same game board with the other players (but beginning at your own entrance), you'll dig a competing network of tunnels by spending increasingly valuable materials to lay polyomino tiles onto the map. You want to extend your tunnels to connect with buried gold and materials, with workshop locations that can transform resources, and especially with toppled statues. Statues are key to scoring, and you'll spend carts to move them through the tunnels to prime scoring locations near the heart of the mountain.