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Ready to get your fill of free online sudoku? HowStuffWorks is here to help challenge your brain, with sudoku puzzles of easy, medium and hard difficulty. (We don't offer evil sudoku … yet.) Like your sudoku games printable? No problem, we got you covered. You also can receive hints if you get stuck, invite a friend to play with you and time how long it takes you to solve one. If you complete sudoku puzzles regularly, you're bound to see that time decrease.

In case you need a refresher, this wildly popular game of numbers is based on a nine-by-nine grid, using the numbers 1 through 9, where none of those numbers can be repeated in the same row across or down or within that nine-by-nine grid. What are you waiting for? Pick a square and start there!

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Originally Published: Oct 26, 2021