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BrainTeaser was a British game show based on the original Dutch format of Puzzeltijd.
The show was broadcast live, with phone-in viewer puzzles being announced and played during the show in addition to the studio game.
During its run from 5 August 2002 to 7 March 2007, it aired on Five Mondays to Fridays, usually for an hour around lunchtime, and was fronted by various presenters rotating with one another.
Beginning in August 2005, a version of the show that exclusively focused on viewer participation was broadcast in a four-hour long block on YooPlay TV every day after the Five broadcast, as part of a thirteen-week trial.