This is a special line of Infocom games published by Dysan for the IBM PC. The manuals are custom sizes but otherwise equivalent to the folio versions. This game may have been sold in plastic baggies, or may have come in a red box like the other Dysan Infocoms. If anyone has more information please let me know. This version is particularly interesting in that it includes an unused sticker that would normally have been found on the front of the folder in the folio version of the game. This reveals the exact source for these stickers.