![Prague, Czech Republic. 07th Nov, 2018. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Jakub Ondrousek from Czech Republic. Prague, Czech Republic. 07th Nov, 2018. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Jakub Ondrousek from Czech Republic.](https://l450v.alamy.com/450v/r0yejw/prague-czech-republic-07th-nov-2018-the-world-sudoku-puzzle-championship-was-held-in-prague-czech-republic-on-november-7-2018-on-the-photo-is-seen-jakub-ondrousek-from-czech-republic-until-now-ondrousek-was-the-world-record-holder-he-solved-the-sudoku-grid-in-1-minute-and-25-seconds-in-2010-credit-michaela-rihovactk-photoalamy-live-news-r0yejw.jpg)
Prague, Czech Republic. 07th Nov, 2018. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo is seen Jakub Ondrousek from Czech Republic.
![Kirchheim, Germany. 30th Sep, 2019. An organizer holds up a bow with Sudoku puzzles, while in the background participants of the Sudoku World Championship brood over their puzzles. Until Saturday, around 230 Kirchheim, Germany. 30th Sep, 2019. An organizer holds up a bow with Sudoku puzzles, while in the background participants of the Sudoku World Championship brood over their puzzles. Until Saturday, around 230](https://c8.alamy.com/comp/2A24C2W/kirchheim-germany-30th-sep-2019-an-organizer-holds-up-a-bow-with-sudoku-puzzles-while-in-the-background-participants-of-the-sudoku-world-championship-brood-over-their-puzzles-until-saturday-around-230-ratefchse-from-around-30-countries-will-be-competing-against-each-other-in-the-competition-credit-uwe-zucchidpaalamy-live-news-2A24C2W.jpg)
Kirchheim, Germany. 30th Sep, 2019. An organizer holds up a bow with Sudoku puzzles, while in the background participants of the Sudoku World Championship brood over their puzzles. Until Saturday, around 230
![Boxing clever: world sudoku championships puts puzzlers on cloud nine | Life and style | The Guardian Boxing clever: world sudoku championships puts puzzlers on cloud nine | Life and style | The Guardian](https://i.guim.co.uk/img/static/sys-images/Guardian/Pix/pictures/2014/8/11/1407782782800/World-sudoku-championship-011.jpg?width=1200&height=630&quality=85&auto=format&fit=crop&overlay-align=bottom%2Cleft&overlay-width=100p&overlay-base64=L2ltZy9zdGF0aWMvb3ZlcmxheXMvdGctZGVmYXVsdC5wbmc&s=df8655d7603bba6bb0fd2736741fa3f9)