![]() ![]() So we can’t begin solving a killer sudoku puzzle the same way we would with a regular grid. But of course to use those we need to have some cells filled in, and when we begin a killer sudoku there aren’t any. Hidden and naked singles, single free cells, matching pairs and so on, all work exactly the same. Some of those are the same as regular sudoku. Solving killer sudoku puzzles requires a number of techniques. But beware: any mistakes in adding up clue numbers will lead to errors that make the puzzle impossible to solve! Solving Killer Sudoku Whether you want to do your killer sudoku arithmatic in your head, or with the aid of a calculator, is up to you. That means that the three numbers that go in that cage must add up to eight. Looking back at our example grid above, we can see that the yellow cage has a little 8 written in the top cell. There’s the arithmetic every killer sudoku puzzle involves a bit of adding up. The sum of the digits within each cage must equal the clue number shown in that cage.Every column, row, and block must contain the digits from 1 to 9 once, and only once.The first rule of killer sudoku is the same as sudoku: Instead we have a lot of little numbers to provide our starting clues. None of the final digits are filled in.They are not restricted to columns, rows, or blocks - they can cross those boundaries. Killer sudoku has an extra type of region, which we call a cage (highlighted above in yellow).There are also a couple of very obvious differences between a killer sudoku puzzle and the regular variety. Although we can’t see it here, the grid will ultimately be filled with the numbers 1-9.There are nine blocks - sometimes called boxes, regions, or nonets.The grid can be split into nine rows and nine columns.It’s nine cells across by nine cells down.There are lots of things that are familiar about this grid if you are used to sudoku: Here’s an easy grid to start us off - it’s a 1-star grid from our Pocket Killer Sudoku range. With that said, let’s dive in and look at a killer sudoku grid, and the rules that govern the puzzle. So if you’ve never solved a sudoku puzzle before, I would recommend reading through our Sudoku From Scratch guide, and doing some simple puzzles first (there are some free ones to download included in our guide). You really need to know how to play the classic version before tackling this kind of puzzle. If that’s not your thing, killer sudoku probably isn’t for you!Ī quick word of caution before we get started: killer sudoku is very much based on regular sudoku. Unlike the classic game, there’s arithmetic involved. Killer sudoku is like regular sudoku but with added mathematics. In each respective case you must place 1-6, 1-8 or 1-9 once each into every row, column and bold-lined rectangle.If you’ve never played killer sudoku but want to get started, or if you’ve taken a look at a killer sudoku grid and wondered how on Earth you’re supposed to begin solving it, then you’ve come to the right place. Killer Sudoku puzzles on puzzlemix appear at a wide range of sizes and difficulties. In other words, guessing is never required. (although any other solution, such as 1+1+4, would in this puzzle be disallowed by the standard rules of Sudoku in any case).Įvery Killer Sudoku puzzle only ever has one possible solution, and it can always be reached via reasonable logical deduction. 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 The values given are 1, 3 and 2 which are of course fine since 1+3+2=6. In this 6圆 puzzle the right-most three squares in the first row must add up to 6. ![]() 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. ![]()
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