Mythos is a Collectile Card Game (CCG) published by Chaosium. Based on the stories of H. P. Lovecraft, players try to solve mysteries before their oponents can drive them insane with nightmare creatures summoned from alternate universes.
Each player assumes the role of a different investigator. Each investigator has unique skills and attributes which will help and hinder them in heir quest to solve a paranormal mystery. Each mystery solved will gain the player a certain number of points. When one player has acquired enough points, they win.
In addition to racing to be the first one to solve enough mysteries, the players may also summon nightmarish creatures from the Lovecraft Universe to attach their opponents. A successful attack will reduce the player's sanity, and should they lose enough sanity, they will go mad, and lose the game.