13 adventures for character levels 0-25.

"Castle Greyhawk contains 13 detailed levels for adventuring and exploration. Each level is a seperate adventure written by a different author and each has its own unique brand of insane and baffling weirdness ... The common theme of this dungeon is that no joke is so old, no pun is so bad, and no schtick is so obvious that it can't be used to confuse and trip up PCs!"

This is a very silly dungeon, indeed. All 128 pages of it.