ZorkThis all-text game improved upon Adventure by better understanding commands, more richly simulating its world, and adding a character, the theif, who appeared throughout to challenge and motivate the player. Zork was originally written for fun by researchers, who developed this interactive fiction collaboratively on a computer at MIT and made the program available for online play. The game was later adapted into successful commercial software, as the Infocom trilogy Zork I-III for home comptuers. Ethan Dicks has made the “original” MIT version of the game available for modern platforms.