Myst

Myst is a point-and-click PC adventure game developed by Cyan Worlds and first published in 1995 by Broderbund. It spawned four sequels, a remake, and a pseudo-MMO that failed and was then resurrected.

The original game was one of the first titles to be released on the then-fledgling CD-ROM format, and is credited with helping to jump-start adoption of it. To this day it remains one of the best-selling PC games of all time.