Time Zone is a multi-disk graphical adventure game written and directed by Roberta Williams for the Apple II.

Developed in 1981 and released in 1982 by On-Line Systems (later Sierra Entertainment), the game was shipped with six double-sided floppy disks and contained 1,500 areas (screens) to explore along with 39 scenarios to solve.

[4] BYTE wrote "The Guinness Book of World Records must be getting ready for a computer game category, if Time Zone is any indication of things to come.

[5] The game received a Certificate of Merit in the category of "Best Computer Adventure" at the 4th annual Arkie Awards.

Time Zone sold poorly; the original retail price of US$99 (equivalent to $323 in 2024) may make it the most expensive computer game in history after inflation.