The Golden Sundial of Pi has been hidden in Time and Space. Will you be the first seeker to locate this fabulous treasure? Unless your name is Sue Cooper or Lizi Newman then the answer is no, as the two named ladies claimed the prize back in 1985.
In Pimania you enter a bizarre world that presents subtle clues towards locating the prize - a sundial made from gold, diamond, lapis lazuli, obsidian, and niobium - said to be worth £6000 in 1982. Therefore the aim of the game is to not only complete it, but also to recognise those clues and apply them to the real world.
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The game is iconic because of the history about it, but it is far too random. "Completion" only really makes sense in the frame of of the original contest. It is a question of patience to wait for the gate to be open at the right times while carrying the right objects, and it does not actually depend on the wits of the player. Due to this, Pimania is a genuine oddity, almost not qualifying as interactive fiction, and resembles more a situational riddle.