Time Zone is a multi-disk graphical adventure game written and directed by Roberta Williams for the Apple II. Released in 1982 by On-Line Systems (now 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.

The game allowed players to travel through time and solve puzzles while meeting famous historical figures such as Benjamin Franklin, Cleopatra and Julius Caesar. However, at the time, most gamers were overwhelmed by the vast game world, which at the time was promoted as the largest of its kind.

Ultimately though, the game bombed due to the fact that the original retail price of the game was US$99, a price considerably higher than the usual for games of the time.