Autosave — Your current game is saved in your browser after every move. If you leave the page, you'll be able to resume exactly where you left off. Saves are kept for 7 days.
Settings ⚙️ — For advanced players, the gear at the top of the page turns on the ✏️ Auto button: it fills in every candidate of the grid at once, or only the cleaned candidates (locked candidates removed). This second option counts as a hint: the game won’t count towards “No hints”. You’ll also find large print there, for easier reading.
Jigsaw Sudoku stats — They are kept separate from your classic 9×9 sudoku and other variant stats. They're stored locally in your browser and never sent to a server.
Jigsaw Sudoku: boxes of every shape
Jigsaw Sudoku, also known as irregular sudoku, keeps the 9×9 grid and its rules, but replaces the nine 3×3 square boxes with nine oddly shaped boxes of nine cells each. Thick lines outline the boxes, and some of them are lightly tinted so you can tell them apart more easily.
That small change makes a big difference. An oddly shaped box spreads over several rows and columns: it crosses more of them than a square does, so your classic sudoku habits need a rethink. Every puzzle has its own boxes: no two look alike.
Sudoku-Land offers 3 levels (easy, medium, hard), notes mode, a step-by-step solver for hints, autosave, a dark theme and the ⚙️ Settings menu. Every puzzle has a unique solution and can be solved by logic alone, without ever guessing: each one has been checked individually.
Jigsaw Sudoku rules
- Like a classic sudoku — every row and every column contains the numbers 1 to 9, once each.
- Oddly shaped boxes — each box, outlined by a thick line, also contains the numbers 1 to 9. It always has nine cells, but its shape is free.
- On the grid — when you select a cell, its whole box lights up, just like its row and column.
Tips for solving a Jigsaw Sudoku
- Read the shape of each box — a long or staircase-shaped box is not scanned like a square: follow the thick lines before looking for a number.
- Cross boxes and rows — an oddly shaped box often touches four or five rows. If, in a box, a number can only go on a single row, it disappears from the rest of that row (and vice versa): that is the key to the medium level.
- Forget the 3×3 squares — two neighbouring cells are not necessarily in the same box: only the thick line counts.
- Let your notes clean themselves — with the “Clear related notes” option in the ⚙️ menu, a correct number is removed from the notes of its whole box, whatever its shape.
All the grids on Sudoku-Land
Frequently asked questions
What is a Jigsaw Sudoku?
It is a 9×9 sudoku whose nine boxes are not 3×3 squares: each one has a free shape, always made of nine connected cells. Every row, every column and every box must contain the numbers 1 to 9, once each.
Why is it called Jigsaw Sudoku?
The boxes fit together like the pieces of a jigsaw puzzle. It is also known as irregular sudoku or Nonomino. In French, it is called “sudoku irrégulier”.
Is Jigsaw Sudoku harder than classic sudoku?
Not necessarily, but it makes you drop a few habits. An oddly shaped box crosses more rows and columns than a square, which opens up new deductions. Sudoku-Land levels are graded with the same techniques as classic sudoku.
Does the Hint button work like in classic sudoku?
Yes: the Hint button opens a step-by-step solver that knows the boxes of your puzzle. It explains each deduction on a small grid where the boxes are drawn, and points to each box with a tiny drawing of its shape. Reading the steps is free; only “Apply this move” uses up a hint.