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Presentation- How To Sudoku

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Cj Uni
Cj Uni

Sudoku is a logic-based number placement puzzle where the objective is to fill a 9x9 grid so that each column, row, and 3x3 box contains the digits 1-9. The rules are simple and it can be played by people of all ages. To solve a Sudoku puzzle, players use logic and deduction to determine which numbers fit in each empty square based on the numbers already provided in the puzzle.

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Presentation- How To Sudoku
? Sudoku requires no calculation or arithmetic skills. ? It is essentially a game of placing numbers in squares, using very simple rules of logic and deduction. ? It can be played by children and adults and the rules are simple to learn.
The objective of the game is to fill all the blank squares in a game with the correct numbers. There are three very simple constraints to follow. In a 9 by 9 square Sudoku game: ? Every row of 9 numbers must include all digits 1 through 9 in any order ? Every column of 9 numbers must include all digits 1 through 9 in any order ? Every 3 by 3 subsection of the 9 by 9 square must include all digits 1 through 9 Similarly, smaller Sudoku puzzles, such as the 4x4 puzzle, must have the numerals 1 through 4 in each row, column and subsection. Larger Sudoku games (16 by 16) must have numerals 1 through 16 in each row, column and region. The principles are the same whatever the size of the game.
Every Sudoku games begins with a number of squares already filled in and the difficulty of each game is largely a function of how many squares are filled in. The more squares that are known, the easier it is to figure out which numbers go in the open squares. As you fill in squares correctly, options for the remaining squares are narrowed and it becomes easier to fill them in. Sudoku's are usually categorised as easy, medium or hard.
The first things to do in tackling a Sudoku puzzle is to scan the rows and columns to see where a certain number might go. E.g. The fact that a 7 is required in the top right corner can be determined by first analyzing its 9 square sub- region. The only numbers missing in the region are a 5 and a 7. However, putting a 5 in the top right box would conflict with the 5 already in the top row and the right most column. The 7, on the other hand, would not conflict with any of the given numbers.
Once the 7 is filled in, deduction requires that only a 5 can go beneath it as all digits from 1 through 9 must be represented in the region. From there, one can turn to the two remaining open boxes in the right column - these must include a 2 and a 4 as the column's digits must represent 1 through 9. One of these options, placing the 4 beneath the 1, would lead to a conflict with the 4 already in that horizontal row, so the only option for this box must be a 2. However, options for boxes are often not that easy to deduce. Another technique is to "pencil in" possibilities and then follow the possible solutions that emerge until a conflict is found. Often these conflicts appear after 2 or 3 numbers are penciled in, and one can return to the start and try the next option until something clicks.
9 3 1 5 6 4 7 5 5 1 2 9 3 7 2 3 What number 3 6 9 7 5 2 would go in the 9 1 RED square? 3 2 4 8 1 9 6 4 4 7 3 2 8 5
9 3 1 5 6 4 7 5 Click on your answer... 5 1 2 9 3 7 1. 5 2 3 3 6 9 7 5 2 9 1 2. 3 3 2 4 8 1 9 6 4 3. 1 4 7 3 2 8 5
INCORRECT SORRY, TRY AGAIN! YOU CAN DO IT!
CORRECT WELL DONE! YOUR A SUDOKU PRO!
9 3 1 5 6 4 7 1 5 5 1 2 9 3 7 2 3 What number 3 6 9 7 5 2 would go in the 9 1 YELLOW square? 3 2 4 8 1 9 6 4 4 7 3 2 8 5
9 3 1 5 6 4 7 1 5 Click on your answer... 5 1 2 9 3 7 1. 1 2 3 3 6 9 7 5 2 9 1 2. 3 3 2 4 8 1 9 6 4 3. 9 4 7 3 2 8 5
INCORRECT SORRY, TRY AGAIN! YOU CAN DO IT!
CORRECT WELL DONE! YOUR A SUDOKU PRO!
9 3 1 5 6 4 7 1 5 5 1 2 9 3 7 2 3 3 6 9 7 5 2 9 1 3 2 4 8 1 9 6 3 4 4 7 3 2 8 5 See if you can complete the rest of the Sudoku!
Here are a few Sudoku Websites that you can practice some more: ? www.websudoku.com ? www.sudokufun.com ? www.dailymail.co.uk/coffeebreak/puzzles/sudoku.html Hopefully now you will be able to complete a Sudoku by yourself, either online, or in the paper or it might even tempt you to purchase a Sudoku Book (who knows!)

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Presentation- How To Sudoku

  • 2. ? Sudoku requires no calculation or arithmetic skills. ? It is essentially a game of placing numbers in squares, using very simple rules of logic and deduction. ? It can be played by children and adults and the rules are simple to learn.
  • 3. The objective of the game is to fill all the blank squares in a game with the correct numbers. There are three very simple constraints to follow. In a 9 by 9 square Sudoku game: ? Every row of 9 numbers must include all digits 1 through 9 in any order ? Every column of 9 numbers must include all digits 1 through 9 in any order ? Every 3 by 3 subsection of the 9 by 9 square must include all digits 1 through 9 Similarly, smaller Sudoku puzzles, such as the 4x4 puzzle, must have the numerals 1 through 4 in each row, column and subsection. Larger Sudoku games (16 by 16) must have numerals 1 through 16 in each row, column and region. The principles are the same whatever the size of the game.
  • 4. Every Sudoku games begins with a number of squares already filled in and the difficulty of each game is largely a function of how many squares are filled in. The more squares that are known, the easier it is to figure out which numbers go in the open squares. As you fill in squares correctly, options for the remaining squares are narrowed and it becomes easier to fill them in. Sudoku's are usually categorised as easy, medium or hard.
  • 5. The first things to do in tackling a Sudoku puzzle is to scan the rows and columns to see where a certain number might go. E.g. The fact that a 7 is required in the top right corner can be determined by first analyzing its 9 square sub- region. The only numbers missing in the region are a 5 and a 7. However, putting a 5 in the top right box would conflict with the 5 already in the top row and the right most column. The 7, on the other hand, would not conflict with any of the given numbers.
  • 6. Once the 7 is filled in, deduction requires that only a 5 can go beneath it as all digits from 1 through 9 must be represented in the region. From there, one can turn to the two remaining open boxes in the right column - these must include a 2 and a 4 as the column's digits must represent 1 through 9. One of these options, placing the 4 beneath the 1, would lead to a conflict with the 4 already in that horizontal row, so the only option for this box must be a 2. However, options for boxes are often not that easy to deduce. Another technique is to "pencil in" possibilities and then follow the possible solutions that emerge until a conflict is found. Often these conflicts appear after 2 or 3 numbers are penciled in, and one can return to the start and try the next option until something clicks.
  • 7. 9 3 1 5 6 4 7 5 5 1 2 9 3 7 2 3 What number 3 6 9 7 5 2 would go in the 9 1 RED square? 3 2 4 8 1 9 6 4 4 7 3 2 8 5
  • 8. 9 3 1 5 6 4 7 5 Click on your answer... 5 1 2 9 3 7 1. 5 2 3 3 6 9 7 5 2 9 1 2. 3 3 2 4 8 1 9 6 4 3. 1 4 7 3 2 8 5
  • 10. CORRECT WELL DONE! YOUR A SUDOKU PRO!
  • 11. 9 3 1 5 6 4 7 1 5 5 1 2 9 3 7 2 3 What number 3 6 9 7 5 2 would go in the 9 1 YELLOW square? 3 2 4 8 1 9 6 4 4 7 3 2 8 5
  • 12. 9 3 1 5 6 4 7 1 5 Click on your answer... 5 1 2 9 3 7 1. 1 2 3 3 6 9 7 5 2 9 1 2. 3 3 2 4 8 1 9 6 4 3. 9 4 7 3 2 8 5
  • 13. INCORRECT SORRY, TRY AGAIN! YOU CAN DO IT!
  • 14. CORRECT WELL DONE! YOUR A SUDOKU PRO!
  • 15. 9 3 1 5 6 4 7 1 5 5 1 2 9 3 7 2 3 3 6 9 7 5 2 9 1 3 2 4 8 1 9 6 3 4 4 7 3 2 8 5 See if you can complete the rest of the Sudoku!
  • 16. Here are a few Sudoku Websites that you can practice some more: ? www.websudoku.com ? www.sudokufun.com ? www.dailymail.co.uk/coffeebreak/puzzles/sudoku.html Hopefully now you will be able to complete a Sudoku by yourself, either online, or in the paper or it might even tempt you to purchase a Sudoku Book (who knows!)