From the back of the adventure: "ARENA OF KHAZAN is Number 12 in a series of Solo Dungeons designed for play with the Tunnels & Trolls system of dungeon delving. If you have trouble getting enough friends together to play T&T, or you have only a little time to kill, the the Solo Dungeons are for you. You need only the rule for Tunnels & Trolls, a few six-sided dice*, paper and pencil, and this booklet in Arena of Khazan, you'll probably also need a 20-sided die or a deck of cards."