The game presents a team of people (initially just one man) involved in an exploration of a vast cave system, which will change from game to game. You begin in an entrance cave just underground, and may explore in any one of six directions: north, east, south, west, up and down (though not all areas have exits in each direction). Exploration reveals a three-dimensional grid of caves and passages, which should be mapped in order to avoid getting lost.
Published as a type-in game in the book How to Write Adventure Games.
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