The Manhole is a computer adventure game intended for children in which the player opens a manhole and reveals a gigantic beanstalk that can be climbed either up or down, leading to fantastic worlds in either case. The game was first released on floppy discs in 1988 by Cyan, Inc. (now Cyan Worlds) and distributed through mail order. In 1989, it was produced for Activision as CD-ROM version based on that floppy disc game. This version is notable for being the first computer game distributed on CD-ROM. It runs in black-and-white on the Apple Macintosh line of computers. It was created using the HyperTalk programming language by brothers Rand and Robyn Miller, who founded the company Cyan and would go on to produce the best-selling adventure game Myst. The Manhole was later also released for the PC Engine and FM Towns. [source:wikipedia]