Contestants from Guildford, Bristol, Somerset, Ormskirk, London and Dingwall take on five rounds of fiendish puzzles. They are split into two teams of three and try to accrue the most points through their powers of puzzling deduction. Then the members of the winning team turn on each other to be named the best of the best and earn a place in the series final where the ultimate puzzler will be crowned. 

Contestants from Rochdale, Wirral, Bath, Dumferline, Edinburgh and Liverpool take on five rounds of fiendish puzzles as they attempt to qualify for the series Grand Final.