![]() ![]() Look at the circled arrow in the top right box that contains three squares in the body. ![]() This can actually be very useful and quickly whittle down the options: for instance, look at the sample puzzle shown to the left in Arrowdoku 2. If it has a body of length 3 and all three squares are in the same region, then the minimum value for the circled cell is 6: since 1+2+3 = 6. If an arrow of length 2 has both squares along the body of the arrow in the same region, then the circled cell must be at least 3. The simplest is this: the circled square at the top of each arrow cannot contain a number lower than 2, because the minimum arrow length is 2, and those two squares can run diagonally. There are various pieces of logic you can use as part of your solving strategy for arrow sudoku. ![]() The hardest part with arrow sudoku puzzles is getting started - because there are far fewer numbers at the beginning of the puzzle, you will probably start off by looking at the arrows rather than the numbers. If you're based in Europe but outside the UK, then this book is also available on the version of Amazon in your country. Buy Arrow Sudoku VOLUME 2 from Amazon (US) for $7.79.Buy Arrow Sudoku VOLUME 2 from Amazon (UK) for £4.99.Please click the relevant link below to purchase this book via Amazon: The book of Arrow Sudoku is available to purchase right now from .uk, and. If you would like to try a few of the puzzles before buying this book, please click the link below: This sets up an intriguing interplay between the head and body of the arrow, and indeed often between different arrows in the grid too.īy using standard sudoku solving logic combined with the novel types of logic introduced by the arrows, you will be able to find the unique solution for each puzzle (no need to ever guess).įor anyone who likes sudoku but is looking for a different or tougher challenge, then this collection of 100 arrow sudoku could be just what you're looking for! The number in the circle at the start of each arrow is the sum of the numbers along the body of the arrow. However the grid also contains arrows which give the puzzle its distinctive name and look. Noughts & Crosses: Blank gridsĪmazing Arrowdoku, Volume 1 & 2 "I managed to complete the entire book, and am hooked ★ ★ ★ ★ ★Īrrow sudoku is an absorbing sudoku variant, with lots of subtle logical rules that can be applied to help solve the puzzle.Īs with normal sudoku you must place the numbers 1-9 once in each row, column and 3x3 box. Your time will be displayed when you finish the Addoku.Puzzle Tools Etc. If you don’t like working against time just click on Hide Timer in the top right menu. The timer starts as soon as you open the Killer Sudoku. If playing in quick mode, there is visual feedback which highlights numbers in red if they are incorrect. If the shaded sets fill a row, column or block with just one number protruding into another row, column or block, then that number will be the total of the shaded squares minus 45.Īlways remember the basic Sudoku rules that no numeral 1-9 can be repeated in any row, column, 3×3 block or set of numbers – you’ll soon unravel the Killer Sudoku! It is also useful to remember that the numbers in each row, column and 3×3 block add up to 45. ![]() Eventually patterns will emerge as you eliminate possibilities. Then do the same with three and four digit sets. You can type these possible numbers in each square. 17 can only be 9 & 8 but 8 could be 1 & 7, 2 & 6 or 3 & 5 so it can’t be 4 & 4 because each row, column, block and set can contain only one of each number. For example, the total 3 can only be 1 & 2. Then look for two-digit sets and work out the possible combinations. Single digits can be filled in straight away. Use the mouse or arrow keys to select cells within the grid and then enter a number by pressing the corresponding key or using the on-screen keypad. Use these totals to find the right numbers to solve the puzzle. No number is repeated in any of these sets. The numbers that occur in the squares linked by a shaded line add up to the total given in the top left-hand corner of each set. The difference is that you are not given numbers to start you off. The Killer Sudoku / Addoku is like a traditional Sudoku in that every row, column and 3×3 block must contain the numerals 1-9. ![]()
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