The Manhole was a game created by Cyan Worlds (then Cyan) before Myst (game). It is notable, not only for being an excellent example of a game with a non-linear plot and marvelous graphics, but for being the first game ever released on CD-ROM. It also featured one of Robyn Miller's fantastic scores, which could be listened to by putting the CD-ROM into a standard CD player. The Manhole was a fun world for children to explore in, but many parents enjoyed the game as well. The first release of the game was in black in white, but later editions used color.