Does the Sudoku solver show the full answer?
Yes, after a unique solution is confirmed. The answer stays behind a separate reveal action so you can inspect the first logical move first.
Bring your own puzzle
A Sudoku solver that explains why
Check whether a grid has one solution, then see the first logical move before revealing the answer.
No upload, account, or saved history. Your grid is analyzed only in this browser tab.
Your grid stays here
Enter a Sudoku
Type directly on the board, or paste 81 cells. Use 0 or a dot for blanks.
Spaces, line breaks, and ASCII | + - grid separators are accepted.
Check the position
0 of 81 cells entered.
Enter the current grid, using zeroes or blanks for empty cells.
Enter the current grid, using zeroes or blanks for empty cells.
How it works
Proof before answer.
Enter the current state of a classic 9 × 9 Sudoku. The solver first checks repeated digits, then tests whether the position has no solution, multiple solutions, or one unique completion.
For a unique puzzle, Clever Pause uses the same logical technique registry that powers its hints and Coach lessons. When the next move is supported, the evidence and deduction target are highlighted on the grid before the full solution is shown.
The current lesson set covers Naked Singles, Hidden Singles, Locked Candidates, Naked Pairs, and X-Wing. A puzzle can still have one solution while requiring a technique outside that set; the result says so instead of inventing an explanation.
Common questions
What does multiple solutions mean?
The entered clues allow at least two different completed grids. Add more of the original givens before treating the puzzle as uniquely solvable.
Why can a unique Sudoku be only partially explained?
Uniqueness and logical technique coverage are different checks. Clever Pause may prove that one answer exists while honestly reporting that its current five-technique registry cannot explain every step.
Is my Sudoku uploaded or saved?
No. The grid is analyzed locally in your browser and is discarded when the tab reloads or closes. Board contents are not included in analytics or URLs.