The H-Coins puzzle 19 May 20
A wonderful and little known coin puzzle, ideal for doing on a pub table.
The Number Column Puzzle 2 December 19
Some puzzles involve some lateral thinking. But when does a 'creative' answer become 'cheating'.
Giving Puzzles a Punchline 15 February 19
There is a craft to turning a mediocre puzzle into a memorable one
The upside down equation 28 December 18
How a curiosity was turned into a puzzle
The Shooting Stars puzzle 19 October 18
Probability puzzles can be very slippery
How to present puzzles on the radio 5 September 18
If you want to present puzzles on the radio, it's not just the content that matters. Like a joke, it's also the way you tell it.
The Mystery of Phantom Puzzle No.137 30 July 18
The story of a phantom puzzle that came from who knows where, and disappeared just as mysteriously.
Ruby Redfort's Spy Mystery 24 February 18
In the spirit of Inspector Morse, an Oxford don solved the mystery of a seemingly flawed puzzle.
From Aardvark to Zebra 10 February 18
A variant on a classic H.E.Dudeney puzzle
Who have more sisters: boys or girls? 18 January 18
If you are spending time with siblings this Christmas, ponder this question: on average who have more sisters, boys or girls?
What's the difference between a puzzle and a maths question? 24 September 17
For most people, puzzles and maths questions provoke very different reactions. But what is the difference?
If ABC goes to ABD.... 16 March 17
Where do Ideas come from? This puzzle gives a clue.
Sleeping Beauty 12 February 17
A puzzle much debated by probabilists has recently resurfaced.
Russian Roulette with a pack of cards 6 July 16
Fifty-two of you have been captured by an evil tyrant with a taste for Russian Roulette. Can you escape?
The puzzle of the two Black Queens 4 September 15
A puzzle with an answer many people will find counterintuitive.
A real life puzzle with an answer that isn't obvious.
Cheryl and the Perfect Logicians 13 April 15
The Cheryl birthday puzzle that recently went viral has opened a can of worms.
The Curious Popularity of Mackerel Questions 6 April 15
A trivia question that led to the pastime of Tubewhacking
The Irksome Tuesday Boy Problem 3 November 13
The answer to this 'classic' puzzle depends entirely on the motives of the person who poses it.
The Sloppy Monty Hall Puzzle 9 September 13
The Monty Hall puzzle is rarely presented properly
The Ice Cream Puzzle 22 July 13
Teenagers and students understandably find this puzzle hard. What's worrying is they don't check their answer makes sense.