by 2006, they were usually £500, £1,000 and £2,000 respectively. There were also various occasional twists to this aspect of the show, including other variations in the prize values, having one, two or four puzzles in a show instead of the usual three, and various bonus games (mostly games of chance) by which a caller can win even more money. These are usually themed to an event (e.g. Wimbledon) or a season (e.g. snow). Two kinds of viewer puzzle are regularly featured: Scramble – a single puzzle of the kind played in the Scramble round by the contestants, usually played only for the first puzzle of each show. Pyramid – similar to the final round of the show, but filled in except for one line in which only the letter added from the row above is given. There are also three kinds of puzzles that are occasionally featured instead: Linkword – the viewer must work out the word that connects the two given words to form compound words or phrases. Celebagram – the parts of a famous person's name are scrambled letter by letter. A game similar to that played on Quizmania and The Mint, in which callers must guess entities with some common theme to win money. This is run as a single game throughout the show in which several callers are taken, and is usually titled according to the theme. The presenters often give clues to the words to aid those unable to work it out, though these often make the puzzles very easy. For example, on one occasion when the word was 'sister', the presenter said 'This type of nurse might look after you on a ward', and later, 'Michael Jackson has one called Janet'. An addition partway through the programme's lifetime was an extra viewer puzzle announced at the end of the show and again during the commercial breaks of the following programme. This is often a Scramble puzzle, but for a prize of £1,000. Cancellation In light of the ICSTIS investigation of the use of premium-rate telephone numbers in various interactive British television programmes as part of a phone-in scandal, Cheetah Productions (a division of Endemol), who created the BrainTeaser format, admitted that some of the show's contestants were fake. On 8 March 2007, Channel 5 resultantly suspended all shows involving premium rate services, claiming they knew nothing about the scam. However, a simple procedure