Dating game shows are game shows that incorporates a variety of matchmaking systems and services in the form of a game with clear rules. Human matchmaking is involved only in selecting the game's contestants, who are usually selected more for the amusement value than any concern for their happiness or compatibility. The audience sees only the game; an important feature of all dating game shows is that the contestants have little or no previous knowledge of each other, and are exposed to each other only through the game, which may include viewing a photograph or at least knowing the basic criteria for participation (typically participants are not already married).