Crusaders of Khazan is a 1990 MS-DOS computer adaptation of the Tunnels and Trolls role-playing game.
Its manual includes background material on the game world, as well as game rules. The story is extensive, and the game supports multiple character play. Three map scales are used: continental, city, and tactical combat. Also included is a color map of Trollworld, the setting of both Crusaders of Khazan and Tunnels and Trolls.
The game is available from Flying Buffalo and in Fiery Dragon's Tunnels and Trolls 30th Anniversary Edition.