1h - Contestants from London, Worcester, Barry, Derby and West Kilbride take on tough puzzles.
55min - With contestants from Guildford, Bristol, Somerset, Ormskirk, London and Dingwall.
1h - With contestants from Derby, Gloucestershire, Croydon, Swadlincote, Wales and Warwick.
1h - Lucy Worsley puts six new contestants through five rounds of fiendish puzzles.
1h - Six contestants from Worcester, London, Rotherham and Kent compete.
1h - Host Lucy Worsley puts six more contestants through a range of fiendish puzzles.
1h - Contestants from Birmingham, Blackburn, London, Manchester and Croydon face five rounds.
1h - With contestants from Edinburgh, Coulsdon, Poole, Tenbury Wells, London and Sheffield.
1h - With contestants from Bristol, London, Bromborough, Aberdeen, Fordingbridge and Croydon.
1h - With contestants from Thetford, Oxford, Powys, Staffordshire, Nottingham and Porth.
1h - In the final round before the play-offs, Lucy Worsley challenges six new puzzlers.
1h - Six contestants from around the UK compete in the play-off to qualify for the Grand Final.
1h - Contestants take on five rounds of puzzles as they attempt to become the Ultimate Puzzler.
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