Instant to start
Open the page and a puzzle is already on the board. No account wall, no download, no splash video.
About Us
About jigsawsudoku.app
We publish a free, modern browser version of Jigsaw Sudoku — the 9x9 sudoku variant with irregular regions — with unlimited generated puzzles, three difficulty levels, pencil notes, undo and hints, on a layout that works on any screen.
Our craft
Nine regions. One answer.
Read the regions, work the rows and columns, and let logic finish the grid. That loop is everything we design around.
- Cells per grid
- 81
- Irregular regions
- 9
- Unique solution
- 1
Cells per grid
Irregular regions
Unique solution
What we make
A free jigsaw sudoku that stays in the browser
jigsawsudoku.app is the site behind our version of Jigsaw Sudoku, a single-player logic puzzle. Each grid is nine irregular, connected regions of nine cells; you fill every row, column and region with the digits 1 to 9 exactly once, starting from a handful of given digits.
We are not an app-store publisher and there is nothing to download. The game is the website. That keeps load times short, works on phones and desktops alike, and avoids an account wall. Puzzles are generated on your device, and your puzzle in progress, best times and streaks live in local browser storage.
If you are comparing this to another jigsaw sudoku site, this page only speaks for jigsawsudoku.app. The rules, difficulty levels and controls described in our how-to-play guide and FAQ match this exact build.
Our story
From Number Place to your browser tab
The modern sudoku grid is only a few decades old, and the irregular-region variant is younger still. We treat the rules as a contract: get them exactly right, and keep the friction as close to zero as we can.
- 01
From Number Place to sudoku
The modern sudoku grid first appeared in 1979 in Dell Magazines as "Number Place", credited to the architect Howard Garns. It was renamed and popularised in Japan by the publisher Nikoli in the 1980s, then exploded worldwide in 2004 when newspapers such as The Times began printing it daily.
- 02
Irregular regions
Once the classic 3x3 layout was everywhere, puzzle setters began swapping the square boxes for nine irregular, connected regions. The result goes by several names — Jigsaw Sudoku, Irregular Sudoku, Nonomino, and in some search results Loco Sudoku — but the rules are the same: 1 to 9 once in every row, column and region.
- 03
This build
jigsawsudoku.app generates a brand-new region layout and solution on your device for every puzzle, removes digits while a solver confirms the answer stays unique, and gives you the tools serious solvers expect: pencil notes with auto-clearing, unlimited undo, optional hints and a timer.
What we stand for
Principles behind every puzzle
Honest puzzles
Every grid is generated on your device and verified by a solver to have exactly one solution, so no puzzle ever depends on a lucky guess.
Yours to keep
Your puzzle in progress, best times and streaks live on your device. There is no login because there is nothing to log in to.
Free, for real
The whole game is free. No hint packs, no energy meter, no interstitial ads between puzzles.
Who it is for
Solvers who want a clean puzzle
jigsawsudoku.app is a family-friendly, single-player puzzle with no chat and no store. A poor fit if you want multiplayer or live events; a good fit if you want sudoku with a twist, on whatever screen is nearby.
Sudoku fans who want more
If classic sudoku has become routine, irregular regions bring back the moment of "where does this go?" without changing the rules you already know.
Short sessions
A puzzle takes a few minutes on Easy and longer on Hard. Your progress is saved automatically, so you can leave and come back.
Solving without an account
Instant play and privacy in exchange for local-only saves. No cloud restore, but also no sign-up.
Why this site
How jigsawsudoku.app is different
Sudoku sites are everywhere. This one exists to ship a single honest, fast jigsaw version — correct rules, verified unique puzzles, and no clutter.
Unlimited fresh puzzles
Puzzles are generated as you play instead of being pulled from a fixed archive, so there is always a new grid one tap away.
Tools that respect your time
Notes that clear themselves, undo without limits, highlights for row, column, region and matching digits, and a number pad that greys out digits once all nine are placed.
No clutter
No auto-playing video, no fake "download our app" banners, no dark patterns. The guides and FAQ describe this exact game.
How we build
Designed for the browser you already have
The game runs entirely on the web: fast loads, tap, click and keyboard controls, and progress that stays local unless you clear your browser data. We use lightweight analytics to see what helps players — never to gate the game behind a profile. The engine on the home page is the one described on our rules pages, so search results and the live game never drift apart.
Play anywhere
Phone, tablet, and desktop share one board. Tap on a touchscreen, click with a mouse, or use the keyboard shortcuts for digits, notes, undo, and hints.
Progress on your device
Your puzzle in progress, best times, and streaks per level are stored locally. You own the continuity of your record without signing up.
Quiet improvement
We watch aggregate usage through Google Analytics to improve pacing and polish. Details are in our Privacy Policy — never as a sales pitch.
Contact
Stay in the loop
Feedback on a puzzle, a bug report, partnership ideas, or a simple hello — we read every message. Hit the button and we will get back to you.
Stay in TouchPrefer the fine print first? Our legal pages cover how the site works and how we handle analytics.