![Prague, Czech Republic. 01st Jan, 2012. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo are seen Jakub Ondrousek (right) from Czech Prague, Czech Republic. 01st Jan, 2012. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo are seen Jakub Ondrousek (right) from Czech](https://c8.alamy.com/comp/R0YEK4/prague-czech-republic-01st-jan-2012-the-world-sudoku-puzzle-championship-was-held-in-prague-czech-republic-on-november-7-2018-on-the-photo-are-seen-jakub-ondrousek-right-from-czech-republic-and-letian-ming-left-from-china-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-R0YEK4.jpg)
Prague, Czech Republic. 01st Jan, 2012. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the photo are seen Jakub Ondrousek (right) from Czech
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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 Shiyao Wang from China who
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Enjoying monotony helps': how to take on the world in competitive jigsaw puzzling | Puzzle games | The Guardian
![Prague, Czech Republic. 07th Nov, 2018. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the right side is seen Letian Ming from China. Prague, Czech Republic. 07th Nov, 2018. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the right side is seen Letian Ming from China.](https://c8.alamy.com/comp/R0YEJ7/prague-czech-republic-07th-nov-2018-the-world-sudoku-puzzle-championship-was-held-in-prague-czech-republic-on-november-7-2018-on-the-right-side-is-seen-letian-ming-from-china-credit-michaela-rihovactk-photoalamy-live-news-R0YEJ7.jpg)
Prague, Czech Republic. 07th Nov, 2018. The World Sudoku & Puzzle Championship was held in Prague, Czech Republic, on November 7, 2018. On the right side is seen Letian Ming from China.
![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://c8.alamy.com/comp/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)