Kingdomino: The Lost Treasures is a mini-expansion for Kingdomino in which mysterious gemstone-filled chests lure rulers to enrich their growing realms. As you expand your kingdom with domino tiles, you may uncover hidden treasures—precious gems that bring additional crowns, but sometimes unexpected risks. This expansion adds a new layer of tactical opportunity to the familiar tile-drafting and kingdom-building experience. After setting up the base game, Treasure tokens are placed nearby, with two revealed to show available gems. Whenever a player places a domino that forms a square of four differently typed, adjacent landscapes, they discover a treasure. They choose one of the two visible Gem tokens and place it at the intersection of those four landscapes, orienting it as desired.