Castle Book II is a universal role-playing game supplement published by Judges Guild in 1981.
Castle Book II is a gamemaster's aid that contains 50 maps of castles and forts drawn on hex sheets, intended to be used in wilderness encounters or for campaign design, and also contains tables for generating castle names randomly.
[1] The material is not designed for a specific game system, allowing the gamemaster to adapt the material to any fantasy role-playing game.
[2] In the May 1988 edition of Dragon (Issue #133), Ken Rolston said, "There are no details for the functions or contents of the individual buildings, but it’s nice to have the layouts when whipping up an adventure setting on short notice.
On the other hand, Castle Book II curiously remains fresh and useful for me despite its outdated design.