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Logic puzzles

December 2023

  • Aerial shot of the GCHQ building in Cheltenham

    Testing times: GCHQ releases annual festive puzzle

    Eight-part problem has been sent to secondary schools and now released more widely for anyone to solve

November 2023

  • This image released by HBO shows Brian Cox as Logan Roy in a scene from the series "Succession." (HBO via AP)

    Alex Bellos's Monday puzzle
    Can you solve it? How cut-throat are you?

    The ruthless pursuit of power

December 2022

  • GCHQ, Cheltenham

    Get cracking: work as a team to solve our festive puzzle, says GCHQ

    The signals intelligence agency has sent out a challenge aimed at secondary school children on its Christmas card

August 2022

  • Take That Studio Session - March 1, 1993<br>Robbie Williams, Mark Owen, Gary Barlow, Jason Orange and Howard Donald of Take That (clockwise from lower left) at the Studio Session in New York City, New York (Photo by Larry Busacca/WireImage)

    Alex Bellos's Monday puzzle
    Did you solve it? Could it be logic?

  • Take That<br>English boy band Take That, circa 1992. Left to right: Robbie Williams, Mark Owen, Gary Barlow, Jason Orange and Howard Donald. (Photo by Tim Roney/Getty Images)

    Alex Bellos's Monday puzzle
    Can you solve it? Could it be logic?

May 2022

  • Blank Sign - Funny Cat<br>"Funny cat peeking out of a blank sign, isolated on white. You can add extra space with your message to the bottom."

    Alex Bellos's Monday puzzle
    Can you solve it? Intrigue at the pet hotel

    Purr-plexing problems from Japan

February 2022

  • Hit the buzzer!<br>Hand of a man hitting an unlabled buzzer. Isolated on white background. Space for your text.

    Alex Bellos's Monday puzzle
    Can you solve it? An Oxford University admissions question

    Hands on buzzers

January 2022

  • colorful wooden toy blocks, texture background<br>DE3D46 colorful wooden toy blocks, texture background

    Alex Bellos's Monday puzzle
    Did you solve it? Gödel’s incompleteness theorem

  • Albert Einstein Presents Award at Princeton University<br>(Original Caption) 3/14/51-Princeton,NJ- The first Albert Einstein Award for Achievement in the Natural Sciences goes to Professor Julian Schwinger (R) Harvard University, a Mathematical Physicist, and Professor Kurt Godel (second from R) the Institute for Advanced Study, a Mathematical Logician. Professor Einstein (L) world renowned mathematician makes the presentation with Lewis L. Strauss (second from L), President of Board of Trustees of the Institute for Advanced Study.

    Alex Bellos's Monday puzzle
    Can you solve it? Gödel’s incompleteness theorem

August 2021

  • Diogenes challenging Plato in the Academy at Athens. Diogenes of Sinope, aka Diogenes the Cynic, c. 412 /404 BC - 323 BC. Greek philosopher. Plato, c. 428/427 – 348/347 BC. Philosopher in Classical Greece and founder of the Academy in Athens.<br>FHXGYR Diogenes challenging Plato in the Academy at Athens. Diogenes of Sinope, aka Diogenes the Cynic, c. 412 /404 BC - 323 BC. Greek philosopher. Plato, c. 428/427 – 348/347 BC. Philosopher in Classical Greece and founder of the Academy in Athens.

    Alex Bellos's Monday puzzle
    Did you solve it? Logical philosophers

    The solutions to today’s puzzles

July 2021

  • Dreaming Spires Deferred: Oxford Empties Amid Coronavirus Lockdown<br>OXFORD, ENGLAND - APRIL 03: A deserted view of The Bridge of Sighs and New College Lane after university students have been sent home and the tourists are staying away during the Coronavirus lockdown on April 03, 2020 in Oxford, United Kingdom. Even though the streets and college greens are empty, scientists are working hard behind the dormant dreaming spires. Researchers and scientists at Oxford University are at the forefront of the war against Covid-19. More than 20 departments from medicine to humanities are working on vaccine research and mapping. The Coronavirus (COVID-19) pandemic has spread to many countries across the world, claiming over 50,000 lives and infecting over 1 million people. (Photo by Christopher Furlong/Getty Images)

    Alex Bellos's Monday puzzle
    Did you solve it? Oxford university admissions questions

    The answers to today’s logical conundrums

January 2021

  • ThreePeople

    Alex Bellos's Monday puzzle
    Did you solve it? A head for hats

  • Hats WhiteBlack

    Alex Bellos's Monday puzzle
    Can you solve it? A head for hats

December 2020

  • ELF<br>WILL FERRELL Film ‘ELF’ (2003) 07 November 2003 CTQ55433 CLASSROOM. TO BE USED SOLELY FOR COVERAGE OF THIS SPECIFIC MOTION PICTURE. Allstar/Cinetext/NEW LINE **WARNING** This photograph can only be reproduced by publications in conjunction with the promotion of the above film. For Editorial Use Only.

    Alex Bellos's Monday puzzle
    Can you solve it? The colourful truth about elves

    Logic with Santa’s little helpers

September 2020

  • bomb icons, mono vector symbols

    Alex Bellos's Monday puzzle
    Did you solve it? Puzzlebombed!

    The solutions to today’s teasers

May 2020

  • Cracking the Cryptic: sudoku solvers become unlikely YouTube sensation – video

  • Sudoku<br>FDK2WE Sudoku

    Alex Bellos's Monday puzzle
    Can you solve it? Sudoku as spectator sport is unlikely lockdown hit

February 2020

  • Common Water Frog in front of a white background

    Alex Bellos's Monday puzzle
    Can you solve it? Leap year logic

    Quadrennial questions

July 2019

  • Venn diagram

    Alex Bellos's Monday puzzle
    Did you solve it? The enduring appeal of Venn diagrams

  • YouresoVenn-01

    Alex Bellos's Monday puzzle
    Can you solve it? The enduring appeal of Venn diagrams

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