Pimania

Pimania is a text-and-graphics adventure game released by Automata UK in 1982 for the BBC Micro, ZX Spectrum, Dragon 32, and ZX81 computers. The player negotiates a surreal landscape with the aid of the mysterious Pi-Man, Automata's mascot. The B side of the game cassette features a bizarre Pimania song played on a VL-Tone and vocals. The Pi-Man also stars in his own long-running, surreal, comic-strip, soap opera in the company's adverts on the back page of Popular Computing Weekly magazine and appears in several subsequent games of different kinds. The catch-phrase for the game's adverts was "There's no blood in our games, it's Automata sauce".

Automata gave a prize of a golden sundial worth £6,000 for the first person to solve the various cryptic clues to its location that were hidden within Pimania. The sundial was eventually won in 1985 by Sue Cooper and Lizi Newman, who correctly worked out that it could only be found on July 22 (because Pi is sometimes rounded to 22/7) at the chalk horse at Hindover Hill near Litlington, East Sussex.

Source: Wikipedia, "http://en.wikipedia.org/wiki/Pimania," available under the CC-BY-SA License.