The Thieves' World boxed set is a role-playing game setting, featuring contributions from noted Thieves World novelists such as Poul Anderson and Robert Asprin. The boxed set includes the following items: The Player's Guide to Sanctuary (two copies) The Game Master's Guide to Sanctuary Personalities of Sanctuary fold-out brown-and-white maps of Sanctuary, the Maze, and the Maze Underground The boxed set is mostly a setting guide, but it also contains sections with statistics and rules for a wide number of different role-playing game systems popular at the time of publication: Advanced Dungeons & Dragons Adventures in Fantasy Chivalry & Sorcery DragonQuest The Fantasy Trip RuneQuest Traveller Tunnels & Trolls.