What the tool does, how to run it, and what to expect from the result.
Enter the given numbers and press Solve. The solver uses backtracking that always fills the most constrained cell first, which cracks even puzzles built to defeat human techniques in a fraction of a second. It also checks the clues: two equal numbers in a row, column or box are highlighted, and it tells you if the puzzle has more than one solution.
A quick way to understand who this helps, what it solves, and where it connects next.
Puzzle players who are stuck, checking, or just curious.
Using the sudoku solver without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
17. It was proven in 2012 (McGuire, Tugemann and Civario) that no sudoku with 16 clues has a unique solution.
Yes. Puzzles rated among the hardest for humans are solved in well under a second, because a computer can simply try and backtrack.
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Possible answers from your clues
Possible answers from your clues. Free, instant, in your browser.
Find words from known letters
Find words from known letters. Free, instant, in your browser.
Roots of ax² + bx + c = 0
Roots of ax² + bx + c = 0. Free, instant, in your browser.
Every word, pangrams and points
Every word, pangrams and points. Free, instant, in your browser.
Text
Check whether two words or phrases are anagrams, with a normalized letter breakdown and the letters that differ. Free, in your browser, nothing is uploaded.
Exact anagrams of any word
Find every exact anagram of a word, plus the words hiding inside it.
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Type the clues, press Solve. Solving runs in your browser in milliseconds.
Clues are bold; the solver's numbers are in the accent colour.