Boss Monster is a tabletop card game where players take on the role of dungeon bosses, aiming to build the ultimate dungeon to defeat invading heroes. Each player uses cards to create rooms, traps, and monsters, strategically designing their dungeon to attract and eliminate adventurers. The game combines elements of strategy and resource management, as players must balance their dungeon's layout and the types of monsters they deploy. The goal is to earn the most victory points by defeating heroes while avoiding damage to their own health. Boss Monster is known for its retro video game art style and engaging gameplay.