Sudoku Online
Unique-solution sudoku puzzles with notes and error check
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Ready when you are
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Introduction to the tool and how to use it
Sudoku Matrix Trainer generates 9x9 sudoku puzzles that always have a unique solution, in four difficulty levels. Click a cell and type 1-9 to fill it, or switch to notes mode to record candidates. Hints, error check, and a solution reveal are included, with time, hint and mistake stats.Message board
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