Choose Difficulty
Controls: Click cells to select, use number keys (1-9) or number pad to fill, Backspace/Delete to clear, N for notes mode.
How to Play
Sudoku is a logic-based number placement puzzle. The objective is to fill a 9x9 grid with digits 1-9 so that each column, each row, and each of the nine 3x3 sub-boxes contains all digits from 1 to 9 without repetition. Use logic and deduction to find the correct placement for each number. The puzzle has a unique solution.
Controls
- Click a cell to select it
- Use number keys 1-9 or tap number pad
- Arrow keys to navigate cells
- Press N to toggle notes mode
- Backspace or X to clear a cell
Features
- • Three difficulty levels
- • Each puzzle has unique solution
- • Error highlighting
- • Notes mode for candidates
- • Cell highlighting
- • Mobile-friendly controls
- • No registration required
Frequently Asked Questions
What is Sudoku?
Sudoku is a logic puzzle where you fill a 9x9 grid with numbers 1-9, ensuring no repetition in rows, columns, or 3x3 boxes.
How do I solve Sudoku?
Look for cells where only one number is possible. Use elimination to find where numbers must go based on existing placements.
Is every puzzle solvable?
Yes, every puzzle generated has exactly one unique solution.
What are notes for?
Notes let you mark possible candidates for a cell before committing to an answer.
Is this free to play?
Yes, completely free. No download or registration required.
Can I play on mobile?
Yes, Sudoku is fully responsive and works on all devices.