Sudoku Puzzle Generator
Auto-generate puzzles by difficulty. Hints, memo mode, and auto-solver.
Fully offline—works anywhere.
STAGE CLEAR!
About
Sudoku Puzzle Generator auto-generates 9×9 puzzles by difficulty level. Features include hint mode, memo/pencil mark mode, undo, and an auto-solver. Puzzles are guaranteed to have a unique solution. Works fully offline in any browser.
How to Use
Select Difficulty
Choose Easy, Medium, or Hard and click START.
Enter Numbers
Click/tap a cell and press a number key or tap the number pad.
Use Hints & Solver
Use Hint to fill one cell, or Auto-Solve for the full solution.
Glossary
- Sudoku
- A logic puzzle on a 9×9 grid. Place digits 1–9 so each row, column, and 3×3 box contains no repeats.
- Backtracking
- A search algorithm that tries values and reverses when a dead-end is hit. Used to generate and solve puzzles.
- Unique Solution
- A valid Sudoku puzzle has exactly one solution. This tool guarantees uniqueness.
- Naked Single
- The most basic solving technique: only one candidate digit can go in a given cell.
- Pencil Mark
- Candidate notes written in a cell to track possibilities.
FAQ
- Q.Are generated puzzles guaranteed to have a unique solution?
- Yes. The generator verifies uniqueness using a solver before presenting the puzzle.
- Q.Does it work offline?
- Yes. All processing is done in JavaScript. No network connection is needed.
- Q.Can I use keyboard controls?
- Yes. Press 1–9 to input, arrow keys to navigate, and Delete/Backspace to erase.
- Q.Is it mobile-friendly?
- Yes. The on-screen number pad handles touch input on phones and tablets.
Use Cases
Brain Training
Keep your mind sharp with daily logic puzzles.
Coffee Break
A quick 5-minute mental workout.
Logic & Reasoning
Sharpen deductive reasoning skills.
Offline Entertainment
Play anywhere with no internet needed.
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