The original 256-page game book was published in 1991 by Phage Press, covering material from the first five novels (the "Corwin Cycle") and some details – sorcery and the Logrus – from the remaining five novels (the "Merlin Cycle"), in order to allow players to roleplay characters from the Courts of Chaos. Some details were changed slightly to allow more player choice – for example, players can be full Trump Artists without having walked the Pattern or the Logrus, which Merlin says is impossible; and players' psychic abilities are far greater than those shown in the books.