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Fill the 9×9 grid so every row, column, and 3×3 box contains digits 1–9. The world's most popular logic puzzle — now with daily challenges and 4 difficulty levels.
Logic skills transfer to business.
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Place digits 1 through 9 in each empty cell. Every row, column, and 3×3 sub-grid must contain each digit exactly once. Start with cells that have the fewest possibilities and use elimination to narrow down options.
Master the "naked singles" technique first — find cells where only one digit is possible. Then learn "hidden singles" and "pointing pairs." For Evil difficulty, you'll need X-wing and Swordfish patterns.
Brooker, H. et al. (2019). "The relationship between the frequency of number‐puzzle use and baseline cognitive function in a large online sample." Int J Geriatr Psychiatry, 34(7), 932-940.