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 Each 3 by 3 box inside the grid must contain all the numbers from 1 to 9.Each column of the grid must contain all the numbers from 1 to 9.Each row of the grid must contain all the numbers from 1 to 9.The idea behind the puzzles is that each of the squares should contain a number from 1 to 9. Most Sudokus are 9 squares by 9 squares (although other varieties are possible), and are subdivided into nine ©Brained Up Ltd/Gareth Moore 2005-2023 - email - publishers please visit Any Puzzle Media - our privacy policy - registered in England & Wales no.Sudoku puzzles are based around a grid, into which you have to place numbers in the right squares. Similar logic allows each corner of the puzzle to be completed:īy then progressing using logical reasoning (guessing is never needed) based on what numbers can fit into which square, the puzzle can be solved: So the top-right number must be 3, and then we can place the numbers next to it. Similarly at the top-right, since we can only place 1 to 9 into the grid the top-right number cannot be '1' because the number to its left would need to be 11, which isn't allowed. The top-left square must contain 9, therefore, and so the square to its right must be 5 (9+5=14) and the square below must be 9. The solution to this cannot involve '7' because the answer would then be 7+7, which would repeat a number, so we can eliminate the 7 here as an option. Now consider the '14' clue at the top-left. ![]() The same applies to the '16' clue at the top-left - the solution must be 7+9 or 9+7. ![]() ![]() It must be 1+3 or 3+1, and this has been written in in 'pencilmarks' to note this. There is only one possible solution for the '4' clue running down at the top-right. ![]() You can repeat a number elsewhere in the same row or column so long as there is at least one clue or shaded square between them. There is one other key rule: the same number cannot be repeated within any run, so the solution to the value '4' cannot be 2+2 but must 1+3 (or 3+1). This value is shown either to the right or below a diagonal line. The rules of Kakuro are simple - place the numbers 1 to 9 into the puzzle grid so that each continuous horizontal or vertical run of empty squares adds up to the value to the left of it or above it respectively.
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