Online Sudoku

The modern version of the Sudoku puzzle was invented by Howard Gans, a 74-year-old retired architect and freelance puzzle constructor from Indiana, USA, and first published by Dell Magazines as Number Place in 1979. An earlier variant that allowed double-digit numbers had appeared as far back as 1892 in French newspaper Le Siècle.

The puzzle was introduced into Japan in 1984 as Sūji wa dokushin ni kagiru, which can be translated as "the digits must be single" or "the digits are limited to one occurrence". This was later abbreviated to Sūdoku .

You can practise your Sudoku skills with the multi-level online puzzle shown below. Click here to open the Sudoku in a convenient popup version. If you want to learn how to complete Sudoku puzzles, I would recommend the Cracking the Cryptic YouTube channel that has branched out from cryptic crosswords to solving Sudoku.

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Digital Marketing Institute (DMA)
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Hiroshima University (Hiroshima)
Institut Catholique (Paris)
School of Oriental & African Studies (London)
Winchester College (UK)