An anonymous adventurer enters the ruins of a vast, subterranean civilization to recover legendary treasures while navigating a treacherous, labyrinthine environment.

The protagonist acts as the player's avatar, tasked with exploring the Great Underground Empire to locate twenty specific artifacts. The environment presents logical puzzles and physical obstacles that require the collection and manipulation of various items found throughout the map. The narrative unfolds through a text-based interface where the player inputs commands to interact with the world, which responds with descriptive prose. The world operates on a strict set of rules governing inventory management, light sources, and environmental hazards.

Readers and players frequently highlight the game's influence on the interactive fiction genre and its role in establishing early computer gaming conventions. Discussion often centers on the difficulty of the puzzles and the effectiveness of the text-only descriptions in creating a sense of place. Critics note the balance between exploration and the logical constraints imposed by the game's parser. The community continues to analyze the game's design as a foundational example of narrative-driven gameplay in early computing history.