Links

dharmon.cc/games/index.php?gid=11 - Contains a multi-platform remake of castle adventure.
deadwoodinc.net/amigan/others - Has graphical maps of the entire game.
the-underdogs.org/game.php?id=3953 - The Underdog's review.
classicgaming.com/ascii/featgame_files/castle/castle.html - ClassicGaming.com's review.
gammax.net/test/room_viewer/room_viewer.php - All the room files listed.
gammax.net/test/room_viewer/room_walker.php - Lets you "walk" through the rooms.

Use the image below for linking.