Myst is a puzzle-solving point-and-click game that was originally released for the Macintosh. The version shown in this run is a homebrew demake for the Apple II. As the Apple II has some significant limitations compared to the Macintosh, the developer had to get creative with the graphics and sound to be able to recreate the experience you'd get from the original game.
Spikestuff nevertheless swiftly maneuvers and beats the game in record time.
You can get the game here.