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Jigsaw Sudoku - Free Irregular Region Puzzle Game Online

Jigsaw Sudoku replaces the standard 3x3 boxes with 9 irregular-shaped regions, each containing exactly 9 cells. Every row, column, and region must contain the numbers 1-9 exactly once. The unique region shapes create fresh solving patterns you won't find in classic Sudoku. Unlimited puzzles at three difficulty levels, generated instantly in your browser.

How to Play Jigsaw Sudoku

Jigsaw Sudoku follows the same basic principles as classic Sudoku, but with a twist: the nine 3x3 boxes are replaced by nine irregular-shaped regions. Each region, row, and column must contain the numbers 1 through 9 exactly once.

The irregular shapes mean you can't rely on the familiar box patterns. Instead, you'll develop new solving strategies as you trace the unique region boundaries. Our three difficulty levels — Easy, Medium, and Hard — provide a satisfying challenge for every skill level.

Basics

  • 1

    Fill the Grid

    Your goal is to fill every empty cell in the 9x9 grid with numbers from 1 to 9. Colored regions replace the standard 3x3 boxes.

    2
    3
    4
    5
    9
    8
    6
    1
    9
    7
    3
    6
    8
    1
    5
    9
    4
    1
    3
    8
    6
  • 2

    Row & Column Rules

    Each row and column must contain the numbers 1-9 exactly once, just like in classic Sudoku. No repeats allowed!

    Each Row

    5
    3
    4
    6
    7
    8
    9
    1
    2

    Each Column

    5
    6
    1
    8
    4
    7
    9
    2
    3
  • 3

    Region Rules

    Instead of standard 3x3 boxes, the grid is divided into 9 irregular-shaped regions, each shown with a distinct color and thick borders. Each region contains exactly 9 cells and must contain the numbers 1-9 exactly once.

    Standard 3x3 Box

    1
    2
    3
    4
    5
    6
    7
    8
    9
    →

    Jigsaw Region

    1
    2
    3
    4
    5
    6
    7
    8
    9

    Each colored region must contain 1-9 exactly once:

    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 4

    Complete the Puzzle

    Fill in all the cells correctly to complete the puzzle. Use logic to deduce numbers from row, column, and region constraints. Try to beat your best time!

    2
    7
    6
    3
    5
    1
    8
    4
    9
    1
    5
    4
    8
    3
    9
    7
    2
    6
    8
    9
    3
    6
    2
    4
    1
    5
    7
    9
    4
    1
    2
    7
    5
    3
    8
    6
    6
    8
    3
    4
    9
    1
    5
    7
    2
    7
    2
    5
    9
    6
    8
    4
    3
    1
    3
    1
    8
    5
    4
    2
    9
    6
    7
    4
    6
    9
    7
    1
    3
    2
    8
    5
    5
    8
    2
    1
    7
    6
    3
    9
    4

Tips & Strategies

Trace the Region Boundaries

Pay close attention to the colored region shapes. Unlike standard 3x3 boxes, irregular regions can stretch across rows and columns in unexpected ways, giving you unique elimination opportunities.

Look for Naked Singles

When a cell can only contain one possible number based on its row, column, and region, fill it in immediately. These "naked singles" often unlock a chain of other cells.

Use Pencil Marks

For harder puzzles, use notes mode to mark all possible numbers in each cell. Then eliminate options by checking what numbers already exist in the same row, column, and region.

Region-Line Interactions

When an irregular region overlaps with only certain cells in a row or column, you can use this overlap to eliminate candidates. If a number must be in a specific part of a region, it can't appear elsewhere in that row or column.

Controls

Mouse / Trackpad

Click on any empty cell to select it, then click a number (1-9) to fill it in. Click the pencil icon to toggle notes mode, and use Clear to remove a number.

Touch Screen

Tap any empty cell to select it, then tap a number to place it. Tap the pencil icon to enable notes mode for marking possible candidates in each cell.

Frequently Asked Questions

What is Jigsaw Sudoku?

Jigsaw Sudoku (also known as Irregular Sudoku or Nonomino Sudoku) is a variant of classic Sudoku played on a 9x9 grid. Instead of the standard nine 3x3 boxes, the grid is divided into 9 irregular-shaped regions, each containing exactly 9 cells. Every row, column, and region must contain the numbers 1-9 exactly once.

How is Jigsaw Sudoku different from Classic Sudoku?

The only difference is the shape of the regions. Classic Sudoku uses uniform 3x3 boxes, while Jigsaw Sudoku uses irregular-shaped regions that vary from puzzle to puzzle. The row and column rules remain the same. The irregular shapes create unique solving patterns and require you to think differently about region constraints.

What do the difficulty levels mean?

Difficulty is determined by the number of pre-filled clues given at the start:

🌱

Easy

41 clues given

Great for learning regions

🌿

Medium

31 clues given

A solid challenge

🌳

Hard

23 clues given

For experienced solvers

What do the colors on the grid mean?

Each color represents one of the 9 irregular regions. Thick borders also outline each region. Every region must contain the numbers 1-9 exactly once, just like the 3x3 boxes in classic Sudoku. The colors make it easy to identify which cells belong to the same region.

Is my progress saved?

Yes, your current game progress is automatically saved in your browser's local storage. If you close the page and come back later, you can continue right where you left off. Your best times for each difficulty level are also saved.

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