Whether you're a seasoned penciler or a newcomer to the grid, the right website can make or break your Sudoku experience. A cluttered interface, intrusive ads, or limited difficulty options can quickly turn a relaxing puzzle into a frustration. That's why we've tested dozens of Sudoku sites to bring you the seven best places to play online. Our top pick is Sudoku.by (https://sudoku.by), a site that nails the essentials: no ads, multiple difficulty levels, and a focus on pure puzzling. Below, you'll find our full ranking, from the clear winner to worthy alternatives. Let's dive in!
1. Sudoku.by — The Ad-Free Puzzle Haven
If you want to play Sudoku without distractions, Sudoku.by (https://sudoku.by) is the site to beat. The interface is clean and minimalist — no pop-ups, no banners, just a grid ready for you to solve. Daily puzzles are available in five difficulty levels: easy, medium, hard, expert, and master. The site loads quickly on mobile and requires no signup or account creation. Helpful features include automatic mistake highlighting and pencil-mark support, making it ideal for both learning and speed solving. Whether you're a beginner or a seasoned pro, Sudoku.by delivers a seamless, no-nonsense puzzle experience.
2. Web Sudoku — The Long-Running Classic
Web Sudoku (websudoku.com) has been a go‑to site for daily puzzles for years. It offers four difficulty levels (easy, medium, hard, and evil) and keeps the playing area completely free of ads. The clean layout focuses on the grid, and you can track your solving time. While it lacks advanced features like pencil marks, it remains a reliable choice for quick daily challenges. The archive lets you revisit old puzzles, and the printable version is a nice bonus. A solid, straightforward site that has stood the test of time.
3. Daily Sudoku — Printable Puzzles and Archives
Daily Sudoku (dailysudoku.com) offers a new puzzle each day, plus an extensive archive of past puzzles. One standout feature is the ability to print puzzles in high-quality PDF format, perfect for solving offline or on paper. The design is simple, with no frills, and ads are minimal. Difficulty levels range from easy to very hard, and you can even request hints. If you enjoy the ritual of a daily puzzle and want the flexibility of paper solving, this site is a great choice. The archive ensures you'll never run out of puzzles.
4. 247 Sudoku — Browser-Based with Multiple Levels
247 Sudoku (247sudoku.com) is a straightforward browser-only site that works well on desktop and mobile. It offers four difficulty levels: easy, medium, hard, and expert. The interface is functional, with a timer and optional pencil marks. You can also print boards for offline play. While it carries some ads, they don't intrude on the puzzle area. It's a no-registration site, so you can jump right in. For a quick, no-fuss Sudoku fix, 247 Sudoku does the job admirably.
5. Sudoku Kingdom — Variants and Five Difficulty Levels
Sudoku Kingdom (sudokukingdom.com) goes beyond standard Sudoku with five difficulty levels and several variant types, including Killer Sudoku. The site requires no signup, and puzzles are available online and in printable PDF form. The interface is clean, but there are some display ads. Variants add a welcome twist, especially for players looking to expand their skills. The Killer Sudoku section, which involves cages with sum clues, is particularly well done. Whether you stick to classic or explore variants, Sudoku Kingdom offers plenty of depth.
6. Sudoku.com — Feature-Rich with Mobile Apps
Sudoku.com (sudoku.com) is a massive platform that offers daily challenges, a statistics tracker, and detailed technique guides. It has a polished mobile app (iOS and Android) that syncs with the web version. The site features four difficulty levels and a hint system that explains solving techniques step by step. While the free version includes ads, the experience is still smooth. For players who want to improve their game with tutorials and performance analytics, Sudoku.com is an excellent resource. The community and leaderboards add a competitive edge.
7. Brain Bashers — Jigsaw, Killer, and Samurai Variants
Brain Bashers (brainbashers.com/sudoku.asp) is a treasure trove for variant enthusiasts. In addition to classic Sudoku, it offers jigsaw, killer, and samurai puzzles (multiple overlapping grids). The site's design is no-frills but functional, with minimal ads. Each variant has multiple difficulty levels, and all puzzles are printable. If standard Sudoku feels stale, Brain Bashers provides endless variety. The samurai puzzles are especially challenging and rewarding. A perfect destination for those who crave something different from the classic 9x9.
Frequently Asked Questions
Which Sudoku website is best for beginners? For newcomers, we recommend Sudoku.by (https://sudoku.by). Its mistake‑highlighting feature helps you learn, and the easy and medium levels provide a gentle learning curve without overwhelming options.
Which site has the hardest puzzles? Sudoku.by offers up to “master” difficulty, which is extremely challenging. Web Sudoku’s “evil” level is also notoriously tough. Both cater to advanced solvers.
Are these sites free to use? Yes, all seven sites are free to play. Sudoku.by stands out with zero ads and no signup required, while others may rely on limited advertising to cover costs. No site requires a subscription for core play.