Sudoku.com is the strongest free browser sudoku: Easybrain's web version serves classic 9x9 grids from easy to extreme plus a daily challenge without pushing its mobile apps, and it answered our check in 300 milliseconds. Web Sudoku and Puzzle-Sudoku.com add unlimited instant grids, SudokuPad renders the variant puzzles Cracking the Cryptic features, Simon Tatham's collection bundles forty ad-free logic games, and BrainBashers, 0h h1 and Minesweeper Online widen the daily logic rotation. All 8 confirmed loading by our automated check on July 8, 2026; hand-replays in progress. No downloads, no forced signups, no paywalled puzzles.
Every entry checked. Last full check: Jul 8, 2026How we verify →0 removed since launch →
| Game | Score | How it differs | Free? | Load time | Checked |
|---|---|---|---|---|---|
| Sudoku.com | Unscored | The mainstream pick: huge free library plus a daily challenge. | Free | 0.3 s | Auto-checkedJul 8, 2026 |
| Web Sudoku | Unscored | The old-school workhorse — instant grids at four difficulties since 2005. | Free | 0.4 s | Auto-checkedJul 8, 2026 |
| SudokuPad | Unscored | The variant-sudoku player used by the Cracking the Cryptic community. | Free | 0.5 s | Auto-checkedJul 8, 2026 |
| Simon Tatham's Portable Puzzle Collection | Unscored | Forty ad-free open-source logic games from one page. | Free | 0.3 s | Auto-checkedJul 8, 2026 |
| Puzzle-Sudoku.com | Unscored | Timed puzzles with leaderboards, part of a whole network of logic sites. | Free | 0.7 s | Auto-checkedJul 8, 2026 |
| BrainBashers | Unscored | A daily rotation of many logic puzzle types, not just sudoku. | Free | 0.6 s | Auto-checkedJul 8, 2026 |
| 0h h1 | Unscored | Sudoku-style deduction compressed into two colors and three rules. | Free | 0.2 s | Auto-checkedJul 8, 2026 |
| Minesweeper Online | Unscored | Classic minesweeper with leagues, dailies and a massive community. | Free | 0.2 s | Auto-checkedJul 8, 2026 |
The mainstream pick: huge free library plus a daily challenge.
Easybrain's Sudoku.com, the biggest mainstream sudoku destination, plays fully in the browser: classic 9x9 puzzles across difficulty levels from easy to extreme, plus daily challenges and seasonal events. Mobile apps exist but are not forced on web players — the site itself serves the puzzles free with ads and optional hints, no account required.
Auto-checked Jul 8, 2026Loads in 0.3 s
The old-school workhorse — instant grids at four difficulties since 2005.
One of the web's longest-running sudoku sites, serving inline-playable puzzles since 2005 — its banner claims billions of unique grids across four difficulties from Easy to Evil. The interface is dated but instant: pick a level, type numbers straight into the grid, check your work, print if you prefer paper. Free with ads, no signup needed.
Auto-checked Jul 8, 2026Loads in 0.4 s
The variant-sudoku player used by the Cracking the Cryptic community.
Sven Neumann's SudokuPad is the web app behind Cracking the Cryptic's featured puzzles: it renders classic and variant sudoku — killer cages, thermometers, arrows, German whispers and more — with proper pencil-marking tools that serious solvers expect. Setters share puzzles as sudokupad.app links that open free in the browser, no download or account needed.
Auto-checked Jul 8, 2026Loads in 0.5 s
Forty ad-free open-source logic games from one page.
Forty one-player logic games by Simon Tatham (author of PuTTY), every one playable as JavaScript in the browser: Solo is sudoku, Pattern is nonograms, Mines is minesweeper without guessing, plus Loopy, Towers, Unequal and dozens more. No ads, no tracking, no accounts — just open-source puzzle generators that produce unlimited instances at chosen sizes and difficulties.
Auto-checked Jul 8, 2026Loads in 0.3 s
Timed puzzles with leaderboards, part of a whole network of logic sites.
The sudoku branch of the puzzle-*.com network, a family of dozens of specialized logic-puzzle sites (nonograms, bridges, loop, binairo and more) sharing one clean interface: unlimited puzzles at multiple sizes and difficulties, plus rated daily, weekly and monthly specials with a global solve-time leaderboard. Free in the browser, no signup required to play.
Auto-checked Jul 8, 2026Loads in 0.7 s
A daily rotation of many logic puzzle types, not just sudoku.
Kevin Stone's long-running brain-teaser site — online since the late 1990s — publishes a fresh slate of daily logic puzzles: sudoku, futoshiki, kakuro, hitori, nonograms, network puzzles and more, alongside a huge archive of riddles and optical illusions. Everything plays in the browser for free; the design is plain but the daily puzzle rotation is dependable.
Auto-checked Jul 8, 2026Loads in 0.6 s
Sudoku-style deduction compressed into two colors and three rules.
Q42's elegant take on the binary puzzle (takuzu): fill the grid with red and blue tiles so that no three of a color sit in a row, every row and column holds equal counts, and no two rows or columns repeat. Rules take thirty seconds to learn, grids scale from 4x4 to challenging sizes, and it plays free in the browser with a companion game, 0h n0, by the same studio.
Auto-checked Jul 8, 2026Loads in 0.2 s
Classic minesweeper with leagues, dailies and a massive community.
The classic Windows deduction game rebuilt as a persistent website: standard beginner-to-expert boards plus no-guess variants, leagues, equipment-style progression, achievements and daily tasks. The site claims a community of over ten million registered players; you can play as a guest for free in the browser, with an optional account keeping stats and rankings.
Auto-checked Jul 8, 2026Loads in 0.2 s
No — that was a filter for this list. Sudoku.com has popular apps but its website serves complete playable puzzles; every other entry is web-first or web-only. Anything that redirected to an app store did not make the list.
SudokuPad is the standard: it renders killer cages, thermometers, arrows, whispers and most other variant rulesets, and it is the app behind the puzzles Cracking the Cryptic features. Setters share puzzles as free sudokupad.app links.
Simon Tatham's collection has forty types (including no-guess minesweeper), BrainBashers rotates daily futoshiki, kakuro and hitori, 0h h1 is a three-rule binary puzzle, and Puzzle-Sudoku.com belongs to a network of sibling sites covering nonograms, bridges, loops and more.
Every entry passed an automated HTTP check on July 8, 2026 that recorded status, response time and page title — the 'auto' tier shown per game. Hand replays upgrade entries to 'replayed'; entries that fail checks or go 120 days without re-verification are removed automatically.
