Enter the letters of your puzzle into the grid. Use only letters from A to I, leave empty cells blank, and click "Solve Puzzle"!
Letter Sudoku, sometimes called Word Sudoku, uses A through I instead of 1 through 9. Each letter must appear once in every row, column and 3×3 box. The letters are logical symbols: this tool does not search for words, use a dictionary or evaluate vocabulary.
Every entered letter is treated as a fixed clue. If you add a tentative answer, the solver preserves it during the search, which can change the completion or make the grid unsolvable.
The result is one A–I arrangement consistent with the clues and standard 9×9 Sudoku constraints. It can be used for comparison, but it is not a hint system and does not explain which logical pattern determines an individual letter.
The search ends when it finds the first compatible completion. It does not prove uniqueness, assign a difficulty rating or certify a custom puzzle. A grid with too few clues may allow several different valid letter arrangements.
Look for a repeated letter in a row, column or box, then compare the clues with the source in reading order. If there is no immediate duplicate, a misplaced clue may still prevent any complete A–I arrangement. Use Clear only when you want to erase the whole grid.