Free Sudoku Online — Play Easy, Medium, Hard & Evil Sudoku Puzzles
Play free Sudoku online in your browser — unlimited daily Sudoku puzzles in easy, medium, hard and evil difficulty. No signup, no downloads, no ads. A fresh Sudoku puzzle every time you click New puzzle, plus a built-in solver, hints and error checking to help you improve.
What is Sudoku?
Sudoku is a classic logic-based number puzzle played on a 9×9 grid. The grid is divided into nine 3×3 boxes. Your goal: fill every empty cell so that each row, each column and each 3×3 box contains the digits 1 to 9 exactly once. No math is required — Sudoku is pure logic and pattern recognition, which is why it has become one of the most popular puzzles in the world, from newspaper pages like the New York Times Sudoku to daily Sudoku apps.
How to play Sudoku
- Click any empty cell in the 9×9 grid.
- Type a digit from 1 to 9 — or use the on-screen number pad.
- Each row, column and 3×3 box must contain 1–9 with no repeats.
- Wrong entries are flagged so you can course-correct fast.
- Use Hint if you get stuck, or Solve to reveal the full answer.
Beginners should start with easy or medium Sudoku, then work up to hard Sudoku and evil Sudoku as your scanning and logic get sharper.
Sudoku strategies & tips
- Scan rows, columns and boxes for a digit that fits only one cell.
- Pencil in candidates for tough squares to narrow choices.
- Look for naked pairs — two cells sharing the same two candidates eliminate those digits elsewhere.
- Hidden singles — a digit that can only go in one square of a row, column or box.
- Never guess. Every valid Sudoku puzzle has a unique logical solution.
Difficulty levels: easy to evil Sudoku
Our Sudoku generator creates a new puzzle at every difficulty on demand. Easy Sudoku is perfect for warming up. Medium Sudoku adds more empty cells and mid-game logic. Hard Sudoku demands multi-step scanning and candidate work. Evil Sudoku is the toughest — sparse clues and chained logic for veteran solvers.
Free printable Sudoku
Prefer paper? Use your browser's print option to save any generated Sudoku puzzle as a printable PDF — a free printable Sudoku sheet anytime you need one for a commute, a classroom or a quiet afternoon.
Why play Sudoku online?
- Instant new puzzles — no waiting for tomorrow's daily Sudoku.
- Live error checking and hints so you learn while you play.
- Works on phone, tablet and desktop — great for travel.
- Sharpens memory, focus and logical thinking.
Sudoku FAQ
- Is this Sudoku free?
- Yes — every Sudoku puzzle here is 100% free, with no signup and no downloads.
- Do you have a Sudoku solver?
- Yes. Click Solve to reveal the full solution, or Hint to fill in a single correct cell.
- How hard can it get?
- Difficulty ranges from easy to hard Sudoku — plenty of challenge for evil-Sudoku fans.
- Is there a new daily Sudoku?
- Better than daily — a fresh online Sudoku puzzle is generated every time you hit New puzzle.
- Does Sudoku require math?
- No. Sudoku uses digits but no arithmetic — it's a pure logic puzzle.
- Can I print the Sudoku puzzles?
- Yes — use your browser's print option to save any grid as a free printable Sudoku PDF.