Enter the numbers of your 16x16 puzzle into the grid below. Use numbers from 1 to 16. Leave empty cells blank and click "Solve Puzzle"!
This solver searches a 16×16 grid for a completion in which the values 1–16 appear once in every row, column and 4×4 box. It uses backtracking in the browser and writes a compatible result into the empty cells when the search succeeds.
A single clue placed one cell too far left or right can create a contradiction elsewhere in this large grid. Checking the transcription before solving is usually faster than diagnosing it afterward.
The completed board is one configuration that satisfies the implemented 16×16 rules and all supplied clues. The tool does not provide a one-cell hint, explain deductions, grade the puzzle or identify which user-entered clue caused a deeper contradiction.
The algorithm stops after finding a valid completion. It does not search for a second result, so it cannot certify that a handmade or lightly clued puzzle has a unique solution. Treat the output as a compatible completion, not as editorial validation of the puzzle.
Check for repeated values in each row, column and 4×4 box, then compare all two-digit entries with the source. If no immediate duplicate appears, one or more clues may still make the remaining cells impossible to complete.