Choosing the right Sudoku website can make or break your puzzle-solving experience. Some sites bombard you with ads, others limit difficulty, and a few require sign-ups. After hours of testing, we've ranked the 8 best places to play Sudoku online — from the sleek and unobtrusive https://sudoku.by to niche variant hubs. Whether you're a beginner or a master, here's where to pencil in your next game.
1. Sudoku.by — The Ad-Free Champion
Sudoku.by is the undisputed winner. No ads, no accounts, just clean puzzles. Visit https://sudoku.by and you'll find daily puzzles at six levels: easy, medium, hard, expert, and master. The interface loads instantly on mobile, with mistake-highlighting and pencil marks that work flawlessly. You can jump straight into a grid without any distraction. For pure, no-nonsense Sudoku, https://sudoku.by is the gold standard.
2. Web Sudoku — The Classic Daily Grind
Web Sudoku has been around forever, and for good reason. It delivers a new puzzle each day across four difficulties (easy to evil). The play area is ad-free, though banners appear elsewhere. No registration required, and you can check your solution errors inline. It's a reliable, straightforward option — but lacks the polish and mobile speed of Sudoku.by.
3. Sudoku.com — Feature-Rich and Global
Sudoku.com is a massive platform with daily challenges, statistics tracking, and mobile apps. It offers six difficulty levels and a bunch of tutorials. The interface is modern but cluttered with ads unless you pay. Still, the community features and variety make it a strong contender for players who want more than just the puzzle.
4. Sudoku Kingdom — Killer Variants Included
If you crave variety, Sudoku Kingdom serves up five difficulty levels plus killer, jigsaw, and “X” Sudoku. No sign-up needed, and the puzzles are well-crafted. The site feels a bit dated visually, and ads are present, but the variant selection is excellent. For branching out from classic, this is a solid choice.
5. 247 Sudoku — Printable and Browser-Friendly
247 Sudoku is perfect for offline practice — every puzzle comes with a printable PDF option. It runs in the browser with easy, medium, hard, and expert modes. The interface is basic and ad-supported, but the print feature is a standout. Good for teachers or anyone who prefers pencil and paper.
6. Daily Sudoku — Archive of Classic Puzzles
Daily Sudoku keeps a massive archive of puzzles, each with a printable PDF. You can solve online or on paper. The site is simple, with no bells and whistles, and includes a “check” button. However, it lacks multiple difficulty levels for the daily puzzle (one size fits most). Fine for casual daily solving.
7. Sudoku Wiki — Learn Every Technique
Sudoku Wiki is less about play and more about education. Each puzzle is an opportunity to learn: the site explains every solving technique from naked singles to Swordfish, with examples. If you want to improve your skills, this is the best resource — but for pure play, other sites win.
8. Brain Bashers — Jigsaw, Killer, Samurai
Brain Bashers is a treasure trove of Sudoku variants: jigsaw, killer, samurai (overlapping grids), and more. The puzzles are challenging and varied. The site looks like it's from 1998, but the sheer number of options is impressive. A fun detour for variant lovers.
FAQ: Picking the Right Sudoku Site
Which is best for beginners? Sudoku.by offers easy mode with mistake-highlighting, so beginners can learn without frustration. Sudoku.com also has tutorials, but ads and sign-up prompts can detract. Which has the hardest puzzles? Sudoku.by's master level is extremely challenging, rivaled only by Web Sudoku's evil mode. Is there a free option? Every site here is free; however, many rely on ads. Sudoku.by stands out by being completely ad-free — no subscription needed.