Jigsaw Sudoku free puzzles, irregular regions
What is Jigsaw Sudoku
Sudoku with the boxes torn up
Jigsaw Sudoku — sometimes called Loco Sudoku — keeps the sudoku rule you know: every row, column and region holds the digits 1 to 9 once. The twist is that the nine 3x3 boxes are replaced by irregular, coloured regions that snake across the grid. Familiar box patterns stop working, so every cell needs a fresh look at its row, column and region.
- Fresh puzzle every time
- Each grid is generated in your browser with its own region layout and one unique solution, so there is always a new puzzle one tap away.
- Easy, Medium, Hard
- Three levels from 38 down to 25 starting digits. Stats and streaks are tracked separately for each.
- Notes, undo, hints
- Pencil notes that clear themselves, unlimited undo, instant red flags on wrong digits, and optional hints when you are stuck.
- Saved on your device
- Your puzzle in progress, best times, and streaks are stored locally — never on a server, and no account is needed.
How to play
How to play Jigsaw Sudoku
Fill the 9x9 grid so every row, column and irregular coloured region holds the digits 1 to 9 exactly once. Start from the given digits and let logic do the rest.
- 1
Read the regions
The 9x9 grid is split into nine irregular, coloured regions of nine cells each. They replace the 3x3 boxes of classic sudoku. Thick lines and colour tints mark where one region ends and the next begins.
- 2
Use the givens
Some cells start filled in bold white. Those digits are fixed. Every row, column and region needs each digit from 1 to 9 exactly once, so a given rules that digit out of its row, its column and its region.
- 3
Fill in the blanks
Select a cell and press a digit, or tap a number on the pad. Correct digits lock in amber; a digit that does not belong turns red and adds to your mistake count so you can fix it straight away.
- 4
Solve to finish
Complete the whole grid and the clock stops. Every puzzle has exactly one solution, so pure logic always gets you there — no guessing is ever required.
Tips to solve faster
- Scan the smallest gaps first: a region, row or column with only two or three empty cells is where the next digit usually falls.
- Pick one digit and sweep it across the whole board. Which region, row and column already hold a 7? Where can the remaining 7s still go?
- Region shapes cut across rows and columns, so check all three groups for every cell. A cell often looks open in its region but is blocked by its row.
- Turn on Notes for Medium and Hard. Write candidates only in cells that are running out of options, not across the whole grid.
- When a digit can only appear in the part of a region that overlaps one row, that digit is not allowed anywhere else in that row.
- A wrong digit shows in red straight away. Undo it, then work out why: it usually means a region overlap you did not check.
- Use a hint to learn, not to win: reveal one stuck cell, then ask what deduction you missed.
FAQ
Jigsaw Sudoku, answered
Straight answers about the free Jigsaw Sudoku puzzles you can play online in your browser.
What is Jigsaw Sudoku?
Jigsaw Sudoku (also called Loco Sudoku, Irregular Sudoku or Nonomino) is a logic puzzle on a 9x9 grid. Instead of nine square 3x3 boxes, the grid is divided into nine irregular, connected regions of nine cells each. You fill the grid so that every row, every column and every region contains the digits 1 to 9 exactly once.
How do you play Jigsaw Sudoku?
Select an empty cell and enter a digit from 1 to 9. A digit may appear only once in its row, once in its column and once in its coloured region. Use the bold given digits as your starting clues, deduce the rest, and the puzzle is solved when the whole grid is filled correctly. Pencil notes, undo and hints are available if you get stuck.
Is Jigsaw Sudoku free to play online?
Yes. jigsawsudoku.app is completely free and runs entirely in your browser. There is nothing to buy, download, or install, and there are no interruptive video ads, premium tiers, or paywalls. Open the page and a puzzle is already on the board.
Do I need to download an app or create an account?
No. The game is the website — a 100% browser-based build with no app store download and no sign-up. Your stats and your puzzle in progress are saved locally in your browser, so there is no login to manage.
How is Jigsaw Sudoku different from regular sudoku?
Only the shape of the groups changes. Classic sudoku uses nine 3x3 boxes; jigsaw sudoku uses nine irregular regions. Rows and columns work exactly as before. Because regions can twist across the grid, you cannot rely on the familiar box patterns, and you have to check each cell against its row, column and region separately.
Is Jigsaw Sudoku harder than classic sudoku?
It feels different rather than strictly harder. Familiar box-based shortcuts no longer apply, so beginners often find the first few puzzles slower. Once you learn to read the region shapes, Easy jigsaw puzzles are comparable to Easy classic ones, and Hard ones reward the same techniques: singles, pairs, and region-and-line overlaps.
Does every puzzle have exactly one solution?
Yes. Each puzzle is generated on your device, then digits are removed one at a time while a solver checks that the grid still has exactly one solution. Every puzzle can therefore be solved by logic alone, without guessing.
What are the difficulty levels?
There are three: Easy (38 given digits), Medium (31) and Hard (25). Fewer givens mean more deduction and more use of pencil notes. The level is set by how many digits start on the board, and stats are tracked separately for each level.
How do mistakes and hints work?
A digit that does not match the solution turns red at once and adds one to the mistake counter; there is no game over, and you can undo or erase it. A hint fills in the correct digit for the selected cell (or a random unsolved cell if none is selected). Best times are recorded only for solves that used no hints.
How do I get better at Jigsaw Sudoku?
Sweep one digit at a time across the whole board, start with the region, row or column that has the fewest empty cells, and use pencil notes only in cramped cells. Learn the region-and-line overlap: when a digit is confined to the part of a region that lies in one row, it cannot appear elsewhere in that row. The tips page walks through each technique.
Does the game save my progress?
Yes. Your puzzle in progress (including notes and the timer), plus your solved count, best times and streaks for each level, are saved locally in your browser. Refresh the page and you carry on where you stopped. Nothing is sent to a server, so a different phone, a new browser profile, or cleared site data looks like a fresh start.
Can I play Jigsaw Sudoku on mobile?
Yes. The board and the number pad fit above the fold on a phone in portrait. Tap a cell, then tap a digit. Notes, undo, erase, hint and new-puzzle buttons sit right under the board, and dealing a new puzzle is instant with no page reload.