Sudoku, from
4×4 to 9×9
120 hand-checked Sudoku puzzles that grow with you, from a gentle 4×4 to a proper 9×9, every one with exactly one solution.
Free · Android · Works offline
Rules
How to play Sudoku
- Fill every empty cell with a number.
- Each row must contain every number exactly once (1–4 on a 4×4, 1–9 on a 9×9).
- Each column must contain every number exactly once.
- Each box (2×2, 2×3 or 3×3) must contain every number exactly once.
- Use notes to pencil in candidates, and undo freely.
Features
- Sizes 4×4, 6×6 and 9×9 across 120 levels.
- Notes, undo, erase and three hints per level.
- Three stars for a clean solve, best time saved.
- Sudoku race: play the same grid as a friend; first to finish wins.
FAQ
Questions
Is this Sudoku free?
Yes, all 120 Sudoku levels in Mathly are free.
Is Sudoku good for beginners?
Mathly starts with 4×4 grids, which take a minute or two, before moving up to 6×6 and 9×9.
Does every puzzle have one solution?
Yes. Each grid is checked by a solver to have exactly one answer.