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This is an example of a Jigsaw Sudoku. The rules of Jigsaw Sudoku are,

- Each row must contain the numbers 1-9 once, and only once.
- Each column must contain the numbers 1-9 once, and only once.
- Each sub-region must contain the numbers 1-9 once, and only once.

This particular puzzle has a 3x3 square in the middle, but all the other regions
are a non-square shape.

We can work out the value of the highlighted cell in this puzzle. We know that the top-middle region must
contain the number '1' somewhere. We can also see that the other three empty cells can't contain a '1' as
those columns already have a '1' in them. So, the highlighted cell must be '1'.

We have used exactly the same techniques as we would normally, it's just the region aren't a regular 3x3
square.

Can you work out the value of the highlighted cells using the techniques you already know? You can fill
these in right now without needing to know any more of the puzzle.

Nonograms

Wordsearch

Nurikabe

Jigsaw Sudoku

Samurai Sudoku

Sudoku

Mathdoku

16×16 Giant Sudoku

Hitori

X-Sudoku

Kids Sudoku

12×12 Giant Sudoku

Hyper Sudoku

Futoshiki

Towers

Killer Sudoku

Greater Than Sudoku

Maze

Arrow Sudoku

Center-Dot Sudoku

Consecutive Sudoku

Odd-Even Sudoku

SudokuXV

Network

Minesweeper

Hashi

SlitherLink

TicTacToe

CellBlocks

Suguru

Kakuro

Train Tracks

Battleships

Masyu

Light Up

Shakashaka

Fillomino

Numberlink

Suko

SetSquare

Dominosa

Spiral Galaxy

Hidoku

Star Battle

Kakurasu

Ballsort

HexaBlocks

SquareBlocks

TriangleBlocks

Picross

Solitare

Pairs

Four in a row