Sudoku solver

Solve a 9×9 sudoku — paste or type the givens and get the solution, with an ambiguity check.

Solved in this browser by backtracking. Nothing is sent anywhere.

Standard 9×9 sudoku only. Up to 2 solutions are counted to tell unique puzzles apart from ambiguous ones. Very sparse grids (few givens) nearly always have many solutions.

How to use

  1. Type the givens into the grid or paste 81 digits.
  2. Solve.
  3. Read the solution and whether it is unique.

What it supports

Standard 9×9 sudoku only. Up to 2 solutions are counted to distinguish unique puzzles from ambiguous ones. Very sparse grids nearly always have many solutions.

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