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Contestants from Thetford, Oxford, Powys, Staffordshire, Nottingham and Porth take on five rounds of fiendish puzzles as they attempt to qualify for the series Grand Final.
In this edition, contestants from Bristol, London, Bromborough, Aberdeen, Fordingbridge and Croydon take on the five rounds of fiendish puzzles.
Contestants from Leeds, Pontypool, Norfolk, Belfast, Derbyshire & London take on five rounds of fiendish puzzles as they attempt to qualify for the series Grand Final.