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Here is an unsolved sudoku puzzle. It consists of a 9x9 grid that has been subdivided into 9 smaller grids of 3x3 squares. Each puzzle has a logical and unique solution. To solve the puzzle, each row, column and box must contain each of the numbers 1 to 9. Throughout this document I refer to the whole puzzle as the grid, a
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GETTING STARTED. To solve a regular Sudoku puzzle, place a number into each cell of the diagram so that each row across, each col-umn down, and each block within the larger diagram (there are 9 of these) will contain every number from 1 through 9. In other words, no number may appear more than once in any row, column, or block.
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The Rule of 45. Forty-five is a special number in Sudoku as it’s the sum of the digits 1-9. Therefore, in a solved Sudoku puzzle, each row, column, and 3×3 block will sum to 45. Where knowing the Rule of 45 becomes helpful with solving puzzles is when you’re playing variants such as Killer Sudoku or Sandwich Sudoku.
- How Is Sudoku played?
- Are Sudoku Puzzles and Magic Squares The Same Thing?
- What Are Sudoku Variations?
- How Are Sudoku Puzzles rated?
- How Does Sudoku Help Your Brain?
- Where Should I Start My Sudoku Puzzle?
- What Is Sudoku Crosshatching?
- Can Sudoku Be Solved Without guessing?
- What Are Some Sudoku Strategies?
- What Is The Naked Pairs Strategy?
The objective of Sudoku is to fill a 9x9 grid made of squares (shown above circled in blue) so that each row, each column, and each full 9x9 square use the numbers 1-9. While solving the sudoku puzzle you can only use each number one time in the square, column, and row. Columns and rows are not limited by the thicker boundaries of the square (also ...
No. In a Magic Square, you also have to take into account the diagonal portion of the puzzle. Sudoku only focuses on the squares, rows, and columns in the grid. So, while the concepts are similar, they are not the exact same game. Some people claim Magic Squares are harder because of the added diagonal factor, while others claim Sudoku requires mor...
There are a huge amount of variations on the basic 9x9 grid version of Sudoku. You can do puzzles that change the grid size to 6x6 or even 25x25. There are also other variations like Sudoku-X which adds in the factor of diagonals making it even more similar to a Magic Square. In Sudoku Even-Odd you have shaded squares that must have either an even ...
Sudoku puzzles come prefilled with numbersin some of the cells. They are ranked by a difficulty level which corresponds with how many numbers come pre-filled in the puzzle. The higher the difficulty the fewer prefilled numbers you will have. The ratings go from one star (easiest) to five stars (hardest).
Just like any other muscle your brain benefits from a good workout. If you find yourself doing mundane tasks daily Sudoku could be a way to sharpen your mind a little. It forces you to really think and plan. It gives you something to take all of your attention off of stressful days or worries. Sudoku has also been linked to declinesin the potential...
Starting your puzzle is sometimes a key part of making sure you solve the whole thing in the end. Because the puzzles are partially filled it can be difficult to make the first move. The best strategy here is to use the process of elimination. Look at what numbers you’d like to use and mark those numbers in the cells with a pencil. You can make the...
This is a technique slightly the opposite of what you just read about. With crosshatching, you start by focusing on one 3x3 square and filling it in with the numbers needed. It’s a way to give you a starting point for your game that doesn’t involve looking at the entire grid. Crosshatching can be especially useful for brand new Sudoku players who a...
Sudoku is not like solitaire where there’s some luck involved. There are definite ways to solve the puzzle. You might be able to guess and get a lucky right answer, but in general yes, sudoku is solved without guessing. Instead of guessing use strategic thoughtful moves. Use the strategy of “scan and find” instead of getting too stuck on one square...
There are actually quite a few strategies sudoku lovers use, and which ones are best vary widely based on who you’re talking to. When it comes to sudoku the best strategy is going to be the one that makes the most sense to you. If a strategy just isn’t working there are others to try so don’t give up. Move on to the next strategy or combine several...
Illustration Of A Naked Pair (As you can see each cell highlighted has 2 possible numbers.) This strategy is based on looking at the puzzle and deciding which numbers are the only possibility for a specific cell. It’s similar to the process of elimination you would’ve used to start your puzzle. In a naked pair, you know you have 2 possible numbers ...
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2 Row, box and column. It is possible to zone-in on a single cell and, by taking account of the other numbers in the row, column and 3x3 block in which it appears, identify the digit that must appear in that cell. Look at the tinted cell in the picture here. If you consider the numbers that are already in the row, the column and the 3x3 block ...
Oct 16, 2024 · Try the X-wing technique on difficult puzzles. An X-wing is an advanced technique used to remove candidates in difficult puzzles. First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots.
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Solving Hard Sudoku Sometimes applying the standard solving techniques to a difficult sudoku puzzle can lead you to an apparent impasse. No matter how hard you try, you can’t seem to overcome it. I’m going to show you an excellent way to get past any such obstacle, so long as the puzzle has a unique solution. It
