Sudoku Solver
Stuck on a puzzle? Type it in below and solve it instantly. Tap a cell, enter the given digits, then press Solve — you'll get the full solution, with a check that the puzzle is valid and has a single answer.
How to use the solver
Enter the numbers that came with your puzzle (the "givens"). Your entries appear in bold; the solver fills the rest in a lighter shade so you can tell them apart. If two of the same digit clash in a row, column, or box, they turn red — fix those before solving.
A proper Sudoku has exactly one solution. If the solver reports multiple solutions, your puzzle is missing a clue somewhere. Want to solve it yourself instead? Learn the methods on our techniques pages.