Hearthstone: Kobolds and Catacombs is an adventure addition to the board card game in the fantasy universe of Warcraft. The expansion adds 135 new maps, legendary weapons for all classes, and a new single-player Dungeon Crawl mode. In this mode, you have to fight bosses with your starting deck. If you win, your deck will become stronger, but so will your opponent's power. Your task is to win eight times.