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# Killer Jigsaw Sudoku puzzles and instructions

Play free Killer Jigsaw Sudoku puzzles:
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Killer Jigsaw Sudoku puzzles replace the rectangular bold-lined boxes in Killer Sudoku with irregularly-shaped 'jigsaw' regions. Killer Jigsaw Sudoku is also sometimes known as Killer Irregular Sudoku, Jigsaw Killer Sudoku or even Killer Sumdoku and Killer Mathdoku.

How to solve Killer Jigsaw Sudoku puzzles
Since Killer Jigsaw Sudoku is an extension of regular Killer Sudoku, if you're not familiar with Killer Sudoku then it's perhaps best to start with the instructions for Killer Sudoku first.

In Killer Jigsaw Sudoku there are irregular jigsaw-regions which replace the 3-by-3 (or other size) box regions in normal Killer Sudoku. These jigsaw-regions, like the boxes, are always the same size. This means that in, for example, a 9x9 puzzle you must place 1-9 once each into every bold-lined jigsaw region, as well as the rows and columns. The jigsaw shapes often make it harder to find the next logical deduction, so this is not a puzzle that's recommended for beginners!

So the aim of the puzzle is to place each of the numbers 1 to 9 (or 1 to the size of the grid) into each of the rows, columns and bold-lined jigsaw shapes in the grid, while also placing these numbers in such a way that each dashed-line cage adds up to the given total.

It's also critical to know that a number can't be repeated inside a dashed-line cage.

Look at the solved puzzle on the left. In this 6x6 puzzle notice how there are 6 bold-lined jigsaw regions, each containing 1 to 6 exactly once. Notice also how the content of each of the dashed-line cages adds up to the number given at its top-left, and how no number repeats inside a dashed-line cage.

Every Killer Jigsaw Sudoku puzzle only ever has one possible solution, and it can always be reached via reasonable logical deduction. In other words, guessing is never required.

Killer Jigsaw Sudoku puzzles on puzzlemix appear at a wide range of sizes and difficulties. Usually they are 6x6, 8x8 or 9x9. In each respective case you must place 1-6, 1-8 or 1-9 once each into every row, column and bold-lined jigsaw shape.

Other types of puzzle
It's not just Killer Jigsaw Sudoku you can solve online at puzzlemix. You can also solve logic puzzles that include these:

Keywords
Are you searching for help with Killer Jigsaw Sudoku puzzles? Stuck on solving Irregular Sudoku? Don't know the instructions for Killer Jigsaw Sudoku? Need Irregular Sudoku instructions? Want solving hints and tips for Killer Jigsaw Sudoku? Then puzzlemix is the place for you to play Irregular Sudoku puzzles online.