Sudoku Hot
Enter the digits from any classic 9×9 Sudoku. The solver checks conflicting clues and fills every remaining cell with a valid solution.
0 clues entered
Tip: paste an 81-character puzzle using digits, zeroes, or dots.
Selected cell: row 1, column 1
Possible digits: 1, 2, 3, 4, 5, 6, 7, 8, 9
Enter a puzzle, then choose Solve puzzle.
Copy the given digits from your puzzle into the grid. Leave unknown cells empty, check for highlighted conflicts, then solve the remaining board.
Every entry must follow the classic Sudoku rule: digits 1–9 cannot repeat within a row, column, or 3×3 box. The solver preserves your original clues and searches for a completion that satisfies all three constraints.
A completed board is most useful when you compare it with your candidate notes. Find the first cell where the answer was forced, then trace which row, column, or box removed the other possibilities.
For structured practice, start with Easy Sudoku and move up only when you can explain each placement. The rules guide and technique articles cover the logic behind the result.
It solves standard 9×9 Sudoku puzzles whose clues do not conflict and that have at least one valid completion. It does not apply Killer Sudoku cage sums.
Yes. It searches for up to two solutions and reports whether the entered clues have one unique solution or allow multiple valid completions.
Copy 81 characters in row order, using digits 1–9 for clues and either 0 or a dot for blanks, then paste while the solver grid is focused.
Yes. The solver runs free in your browser and does not require a download or account.