Sudoku Solver

Solve any Sudoku puzzle

Every row, column and 3×3 box must contain the digits 1–9 exactly once.

Clues (given cells)

Solution

Unique solution

Solved by

Logic alone (no guessing)

Solution string

534678912672195348198342567859761423426853791713924856961537284287419635345286179

Given
Deduced by logic
Filled by search

About this calculator

The Sudoku Solver fills any 9×9 Sudoku puzzle so every row, column and 3×3 box contains the digits 1–9 exactly once. Enter your clues on the interactive grid and it finds the solution instantly using backtracking search with the minimum-remaining-values heuristic. It checks that the clues are legal, tells you whether the puzzle has a single unique solution, and colour-codes each answer by whether it was deduced by pure logic or required a search.