Please use logical thinking instead of guessing! Each puzzle only has one solution.

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Please use logical thinking instead of guessing! Each puzzle only has one solution.

• In pen mode, you can directly import the candidate number by using Shift + number (Alt + number).
• In pencil mode, you can directly import numbers by using Shift + number (Alt + number).
• Key C (or Del, BackSpace): to deselect the number of the lattice or the candidate number.
• Key ESC: to deselect.
• Key P: a toggle switch to change from pencil and pen mode.

# What is Jigsaw Sudoku?

Jigsaw Sudoku is also referred to puzzle Sudoku. It is another type of standard Sudoku. Different from standard Sudoku, jigsaw Sudoku uses irregular gridding groups to replace traditional 3x3 grids.

Jigsaw Sudoku puzzles on Sudoku.cool have seven sizes of “3x3,4x4,5x5,6x6,7x7,8x8,9x9” with ten difficulty levels. By pressing "New Puzzle...", you can choose game size and difficulty level.

## Rules of Jigsaw Sudoku

The solving process for Jigsaw Sudoku is to fill numbers from 1-N in NxN grids.Numbers cannot be repetitive in each row, each column, each group (N grids in rough-line boxes).

• Number 1-N can only appear once in each column.
• Number 1-N can only appear once in each row.
• Number 1-N can only appear once in each group.

Jigsaw Sudoku can also add rules of having two diagonal lines. The new games can be referred to Jigsaw Diagonal Sudoku or Jigsaw X Sudoku .

## Printable Irregular Sudoku Puzzles (Daily update)

This website will provide you printable irregular sudoku puzzles, we daily update including solutions. We recommend using a A4 paper.

3X3 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4

4X4 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4 Level:5 Level:6 Level:7 Level:8 Level:9 Level:10

5X5 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4 Level:5 Level:6 Level:7 Level:8 Level:9 Level:10

6X6 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4 Level:5 Level:6 Level:7 Level:8 Level:9 Level:10

7X7 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4 Level:5 Level:6 Level:7 Level:8 Level:9 Level:10

8X8 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4 Level:5 Level:6 Level:7 Level:8 Level:9 Level:10

9X9 Irregular Sudoku Puzzles Level:1 Level:2 Level:3 Level:4 Level:5 Level:6 Level:7 Level:8 Level:9 Level:10