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# Killer Sudoku puzzles and instructions

Play free Killer Sudoku puzzles:
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Killer Sudoku puzzles include all the rules of regular Sudoku but add in dashed-line 'cages' which must sum to given values. Killer Sudoku is also sometimes known as Sumdoku, Mathdoku or Addoku.

How to solve Killer Sudoku puzzles
The name 'Killer' Sudoku arises because of the wicked twist on the standard Sudoku puzzle, since you must not only place each of the numbers 1 to 9 (or 1 to the size of the puzzle) into each of the rows, columns and bold-lined 3x3 (or other size) boxes but you must also place the numbers into each dashed-line cage so that they add up to its given total - and without repeating a digit in a dashed-line cage.

Look at the solved puzzle on the left. In this 6x6 puzzle the right-most three squares in the first row must add up to 6. The values given are 1, 3 and 2 which are of course fine since 1+3+2=6. But because you cannot repeat a number within a cage this means that we knew the contents were 1+2+3 in some order even before we started solving (although any other solution, such as 1+1+4, would in this puzzle be disallowed by the standard rules of Sudoku in any case).

Every Killer 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 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 rectangle.

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

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