This classic game, the first of a franchise developed by Infocom, was very popular in the 1980's. It is a text-based interactive fiction game, in which the player navigates the game world by entering typed commands.

For the intrepid adventurer who seeks the great Underground, countless wonders await: trolls, thieves, treasures galore, quantities of water, piles of plastic, unknown viscous materials, and small chunks of vitreous slag. Your journey begins here!