![]() ![]() Eliminating numbers from rows, columns and boxes: Eliminating all the above numbers leaves 2 as the single candidate for square b4. Taking a careful look at square b4 we can see that 3, 4, 7 and 8 are already used in the same box, 1 and 6 are used in the same row, and 5 and 9 are used in the same column. Often only one number can be in a square because the remaining eight are already used in the relevant row, column and box. This means that square i3 is the only place left for 1. However, square g4 also contains 1, so no additional 1 is allowed in column g. In this example, row 1 and row 2 contain 1s, which leaves two empty squares in the bottom of box 3. The same technique can be expanded by using information from perpendicular rows and columns. This leaves square e1 as the only possible place into which 9 can fit in. Looking at box 1 and box 3 we can see there are already 9s in row 2 and in row 3, which excludes the two bottom rows of box 2 from having 9. ![]() In our first example we will focus on box 2, which like any other box in Sudoku must contain 9. Here are some ways of using scanning techniques: 1. The scanning technique is also very useful for hard puzzles up to the point where no further progress can be made and more advanced solving techniques are required. The scanning technique is fast and usually sufficient to solve easy puzzles all the way to the end. The easiest way starting a Sudoku puzzle is to scan rows and columns within each triple-box area, eliminating numbers or squares and finding situations where only a single number can fit into a single square. ![]() The grid is also divided into nine 3x3 sub-grids named boxes which are marked box 1 through box 9. Just click it again to return to puzzle number form.Sudoku grid consists of 81 squares divided into nine columns marked a through i, and nine rows marked 1 through 9. Click the pencil in the right bottom corner to turn the numbers into notes. ![]() As the game progesses, you may want to use notes. To highlight numbers, click a number that has aready been placed inside the sudoku puzzle. If not, the number will return to the outside and time will be added to your overall sudoku game time. If the number is correct, the sudoku tile will slide into its correct slot. To play 24/7 Sudoku, employ the basic object of the game by clicking an open space and either typing the number that belongs, or selecting it from the numbers on the side of the sudoku board. Every row, column, and 3x3 box in the sudoku board must contain the digits 1 through 9 only once! As the difficulty progresses, the sudoku game becomes harder, and you'll have to employ more advanced and strategic logic to solve the puzzles. The sudoku board is broken down into nine 3x3 squares. Sudoku is a brain challenging number game, played on a 9x9 sudoku board. Welcome to 24/7 Sudoku - the best in free, online sudoku games! 24/7 Sudoku offers all the difficulties a beginner or seasoned sudoku player will enjoy! This free sudoku website features hundreds of Easy Sudoku puzzles, Medium Sudoku puzzles, Hard Sudoku puzzles, and Expert Sudoku puzzles! 24/7 Sudoku is sure to keep you playing this great sudoku game all day, every day! ![]()
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