Updated Apr 15, 2026 · 7 min read
5 Best websites to play sudoku free in 2026
There are dozens of free sudoku sites. Most are mediocre, ad-heavy, or built for desktop and ported badly to mobile. After playing hundreds of puzzles across the top candidates, here's the honest version — including where this site (PlaySudokuFree) falls short.
This is not a sponsored roundup. Every site below is linkable and free. The rankings reflect daily-use experience, not SEO vanity metrics.
The short answer
For the biggest audience and most polished puzzle generator, use Sudoku.com. For a no-account, no-download, ad-light experience optimized for mobile browser play, use PlaySudokuFree or SudokuOnline.io. For long-form practice with extensive stats and community features, LiveSudoku is the sleeper pick. Avoid sites that force registration just to save a streak.
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1. Sudoku.com — the giant
Sudoku.com
The 46-million-visits-a-month leader. Best-in-class puzzle generation, statistics, techniques training, and cross-device sync if you create an account. The companion mobile app is genuinely excellent.
ProsMassive audience, refined UI, strong stats, app ecosystem, trusted brand.
ConsWeb version is ad-dense, registration nudges everywhere, premium paywall for features that used to be free.
2. WebSudoku.com — the original
WebSudoku
One of the oldest free sudoku sites still online. Ad-light, no registration, works forever. The interface looks like 2005 and has not been updated meaningfully in years — which some players love and others find unusable on mobile.
ProsZero friction, trusted, lightweight, generous four difficulty levels, no account pressure.
ConsDesktop-first layout, tiny tap targets on mobile, no streak tracking, no modern features.
3. 247Sudoku.com — the feature pile
247Sudoku
1.9 million monthly visitors. Covers standard sudoku plus variants (killer, samurai, jigsaw). The UI is cluttered and ad-heavy, but the variety of puzzle types is unmatched.
ProsBig variety of sudoku variants, generous free play, big brand in the casual-game network.
ConsVisual clutter, intrusive ads, mobile layout feels shoehorned in.
4. PlaySudokuFree.com — the no-friction option (yes, this site)
PlaySudokuFree
The site you're reading. Built with one rule: no signup, no app install, no ad wall between you and the first puzzle. Four difficulty levels, daily challenge with streak, dark mode, and mobile-first design. Fair disclosure: our audience is still small and we don't have as many puzzles or variants as Sudoku.com.
ProsInstant play, no registration, ad-light, great mobile experience, daily streak, dark mode.
ConsSmaller catalog than the giants, no puzzle variants yet (classic 9x9 only), no cross-device sync.
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5. SudokuOnline.io — clean and underrated
SudokuOnline.io
Around 748K monthly visitors. The interface is clean and modern with sensible mobile ergonomics. Fewer features than Sudoku.com, but the ones that exist work well. Ad load is moderate.
ProsModern UI, good mobile experience, reasonable ad placement, multiple difficulty levels.
ConsSmaller than the top two, fewer puzzle variants, limited stats tracking.
At a glance
| Site | Ads | Account | Mobile | Daily challenge |
|---|
| Sudoku.com | Heavy | Optional (nagged) | Excellent | Yes |
| WebSudoku | Light | None | Poor | No |
| 247Sudoku | Heavy | Optional | Fair | No |
| PlaySudokuFree | Light | None | Excellent | Yes |
| SudokuOnline.io | Medium | None | Good | Yes |
How to pick one
If you want the biggest audience and most polish: Sudoku.com. Accept the ads.
If you hate ads and want zero friction: PlaySudokuFree or SudokuOnline.io.
If you want variant puzzles: 247Sudoku.
If you like old-school simplicity on desktop: WebSudoku.
Frequently asked questions
- What is the best free sudoku website?
- Sudoku.com has the largest audience and most polished app, but its web version is ad-heavy. For a clean, ad-light, no-registration experience on mobile, PlaySudokuFree and SudokuOnline.io are stronger picks.
- Which sudoku site has the fewest ads?
- PlaySudokuFree and SudokuOnline.io both run minimal, non-intrusive ads placed outside the puzzle area. Sudoku.com and 247Sudoku serve more frequent ads, including occasional interstitials.
- Do I need to create an account to play sudoku online?
- No. All five sites on this list allow you to play immediately without any account, email, or download. Progress and streaks save to your browser locally.
- Which free sudoku site works best on mobile?
- PlaySudokuFree, Sudoku.com, and SudokuOnline.io are fully mobile-optimized with touch-first interfaces. WebSudoku and 247Sudoku still feel desktop-first on phones.
- Is there a free sudoku site with a daily challenge?
- Yes. Sudoku.com, PlaySudokuFree, and LiveSudoku all offer a shared daily puzzle with streak tracking.
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