Generators4 min read
Play Sudoku: 450 Unique Puzzles Online
Play Sudoku with 150 puzzles per difficulty (easy, medium, hard). Sign in to save progress.
Try the free online tool mentioned in this guide:Sudoku
Sudoku rules
1. Fill a 9×9 grid so every row, column, and 3×3 box contains digits 1–9. 2. Each number appears exactly once per row, column, and box. 3. Some cells are pre-filled; these are givens. 4. No arithmetic required; pure logic.
How to play
- Click a cell to select it.
- Type a digit (1–9) or use arrow keys to navigate.
- Highlight conflicts — impossible numbers are grayed out.
- Check progress — see if you've completed rows/columns.
- Clear cell — delete or press backspace.
Difficulty levels
- Easy — many givens, logical deduction only.
- Medium — fewer givens, requires planning.
- Hard — minimal givens, advanced techniques needed.
450 puzzles (150 per level) keep you challenged without repeats.
Strategies
- Naked singles — find cells with only one possible value.
- Hidden singles — find values that fit only one cell in a row/column/box.
- Pairs/Triples — eliminate candidates by logical inference.
- Advanced — X-wings, Y-wings, swordfish (look these up if interested).
Frequently asked questions
Can I get hints?
Highlighting conflicts is the main aid. Hint buttons or solver features may be added.
Can I undo moves?
Click to clear cells. Full game undo may come later.
Is there a timer?
Yes, tracks solve time. Compete against yourself to improve.