Here is the only release of the epic Time Zone. It came in a very large (8.5"x12") box and contained 6 diskettes! When it was released it retailed for $99.95 which hurt sales of the game. It was the largest computer game to date ('81-'82) and today it is featured in the Smithsonian Institue as the most advanced computer game of its time.
In On-Line Systems software catalog it is described as "for the skilled adventurer only." It also says "This game should take over a year to play."