Gloomhaven is a cooperative board game designed by Isaac Childres, set in a dark fantasy world. Players take on the roles of mercenaries, each with unique abilities, as they explore dungeons, complete quests, and battle various enemies. The game features a campaign mode with branching storylines and character progression. The gameplay combines tactical combat with a card-driven system, where players use action cards to perform attacks, move, and interact with the environment. Gloomhaven is known for its deep strategy, rich narrative, and extensive replayability, making it a popular choice among board game enthusiasts.