Zork 1: Solid Gold

Also known as “release 52,” this is Infocom’s true final version. It’s been upgraded to Z-Machine version 5, which had been introduced with Beyond Zork, and has a parser up to parity with other Infocom games at the time, supporting useful commands such as OOPS.

The single biggest addition is an interactive “Invisiclues” hint system, which can be summoned any time by typing “hint.” Apart from that, the amount of content added or changed from 88 is disappointingly scant, and it does not appear to use any of Z-Machine 5’s features other than the parser improvements.

Zork: The Great Underground Empire is a classic text adventure game. The player begins as an "adventurer" standing near a white house in a nice forest, but soon descends into the Great Underground Empire, where most of the game takes place. The player's quest is to collect the Nineteen Treasures of Zork.

As was typical for adventure games of its era, Zork does not use graphics. Instead, it communicates with the player via text, and the player interacts with the game by typing commands, such as "examine mailbox" or "take torch". For movement, the player types in geographical directions (such as "north" or "east" - or just "n" and "e"), and can check what items are being carried with the "inventory" command (or just "i").