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The Crystal Maze was a British game show, produced by Chatsworth Television and shown on Channel 4 in the United Kingdom between 15 February 1990 and 10 August 1995. There was one series per year, with the first four series presented by Richard O'Brien and the final two by Ed Tudor-Pole. Each show was one hour long, including adverts. The show was originally intended to be a British remake of the French programme Fort Boyard, devised by Jacques Antoine. However, the unavailability of the French show's set led British producer Malcolm Heyworth to reinvent the show, using themed zones as a means to keep the show visually fresh. The series is set in "The Crystal Maze", which features four different "zones" set in various periods of time and space. A team of six contestants take part in a series of challenges in order to win "time crystals". Each crystal gives the team five seconds of time inside "The Crystal Dome", the centrepiece of the maze where the contestants take part in their final challenge. The maze cost £250,000 to build and was the size of two football pitches. At its height the show was the most watched on Channel 4, regularly attracting between 4 and 6 million viewers. In 2006 and again in 2010, the show was voted "greatest UK game show of all time" by readers of UKGameshows.com. This site describes the programme as "a highly-ambitious, high-risk show that paid off handsomely."