Taking the sumdokus idea even further, the next level is called " kenken" or "mathdoku" - the idea is the same as the killer sudoku but there are not just sums in the cages, there are multiplication, subtraction and division too. Because the killer sudokus are a bit like a cross between sudoku and kakuro in that respect, some people call them "kakudokus" or "sumdokus" too, thereby neatly avoiding the puerile sound of "killer sudoku". Also the Kakuro cheat sheet can come in handy to work out the possibilities, as the combinations are the same. The links given by the Wikipedia article contain examples to try yourself. Listing the possibilities of squares can be a particularly useful tactic. Instead, dotted lines are drawn grouping certain squares together, and the sum of these squares is given.ĭifficulty of these "killers" varies greatly, and the logic paths for calculating the squares' values can become especially tortuous. There are a couple of examples for you to try out here now.Īnother major variation to Sudokus is the so-called " Killer Sudoku", whereby the grid has no numbers filled in for you at the start. These can get tricky and obviously take a while to complete. One more complicated variation is the "X-Sudokus", or "Samurai Sudokus", where five normal Sudokus overlap each other. Kids can practice with four or six-valued sudokus too. Up to 16 by 16 is about as big as they get, using hexadecimal values (0-9 and A-F) in each of the four-by-four-by-four-by-four cells. The simplest variation is to not use numbers 1 to 9, but either smaller or larger grids. With anything as popular as the sudoku phenomenon has become, there are bound to be variations invented to make it more interesting. PDF file (10 kb) which contains four blank grids, and print it out for your own It can also be convenient if you've gone wrong on a paper Sudoku and want to start again. Having a pre-prepared sheet can be handy then, so you can copy the numbers across and start solving. There are, of course, times when pen (or pencil) and paper are all that are available, and maybe you want to take a SudokuĪnd solve it later on paper. Which ones have I already solved?Ĭan't remember which ones you've finished already? Check out your progress. You can also use this helper gadget to solve any puzzle that you find in the newspaper for example - just go to theīlank sudoku and fill in the starting numbers yourself. Out how to use it, or if you're brave enough to jump right in you can try out the first of the ten puzzles here, You can read more about the helper to find Undo your moves easily and gives visual highlighting clues. Where you can have a go of the puzzles yourself in the browser, and the game will warn you if you've gone wrong. Riiiiight.Īs part of the Activity Workshop, there's an applet game (a bit like the Nonograms one), There are various tricks you can try to work out which numbers go where, and these are outlined in the Maths, because there isn't any - you don't ever have to add up or multiply the numbers together, just make sure thatĮach number appears where it should. The rest is just logicĪnd a methodical approach, filling in numbers as you work them out, until the grid is complete. The picture to the right shows an example of a sudoku, with some of the numbers filled in. There should be only one solution which fits, so the problem is just filling in the rest of the numbers! You to figure out where the numbers are allowed to go.Įach puzzle you see starts off with a different position, with a different number of numbers already filled in at the The combination of these three rules, where each number must appear once and only once per row, column and box, allow
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