Sudoku Intermédiaire en Ligne #844983 - Sudoku en direct (2024)

FAQs

How do you find the answers to Sudoku? ›

One of the best ways to get started with solving a Sudoku puzzle is to look for “low-hanging fruit” – the rows, columns or squares that already have the most numbers filled in. This will make it easier (most of the time) for you to figure out which numbers go in the remaining empty spaces.

The most basic strategy to solve a Sudoku puzzle is to first write down, in each empty cell, all possible entries that will not contradict the One Rule with respect to the given cells. If a cell ends up having only one possible entry, it is a "forced" entry that you should fill in.

Sudoku does not require guessing. In fact, when solving Sudoku puzzles, you're better off NOT guessing at all. Sudoku is a logic puzzle, using the power of simple deductive reasoning and process of elimination to fill in the gaps in the grid. Simply put – you don't need luck to play Sudoku.

Rules of Addition Equation Sudoku

The puzzle can be solved by finding the values of the unknown digits (all indicated by asterisks) in the squares of the 9x9 grid. At the bottom and right side of the 9x9 grid are numbers, each of which is the sum of a column or row of unknown digits marked by asterisks. * + * = 9.

The rules for sudoku are simple. A 9×9 square must be filled in with numbers from 1-9 with no repeated numbers in each line, horizontally or vertically. To challenge you more, there are 3×3 squares marked out in the grid, and each of these squares can't have any repeat numbers either.

Modelling Sudoku as an exact cover problem and using an algorithm such as Knuth's Algorithm X and his Dancing Links technique "is the method of choice for rapid finding [measured in microseconds] of all possible solutions to Sudoku puzzles." An alternative approach is the use of Gauss elimination in combination with ...

There's no correct way to solve a puzzle, but we hope that, using the techniques demonstrated here, you can become your best Sudoku self. But first, the basics: A classic Sudoku has nine boxes, each subdivided into nine cells, for a total of 81.

The 45 Rule

An essential Killer Sudoku solving technique is the "45 rule". This uses the fact that every row, column and block must contain each of the numbers 1 to 9 once. Therefore, the total of all numbers in one row, column or block will always be 45.

Some people approach Sudoku as a game of luck – these players guess which numbers (or words) belong in each empty space. However, Sudoku is designed to be a game of logic and skill, not luck. Efficient Sudoku players recognize patterns and spot opportunities. There is no “luck” in “logic”.

"Hidden pairs" technique works the same way as "Hidden singles". The only thing that changes is the number of cells and Notes. If you can find two cells within a row, column, or 3x3 block where two Notes appear nowhere outside these cells, these two Notes must be placed in the two cells.

What is the magic number in Sudoku? ›

Solving the Sudoku: Magic number turns out to be 17.

If three candidates can be found in only the same three Cells of a region (Row, Column or Square), then one of these candidates is the solution for the first of these Cells, a second one is the solution for the second Cell and the last candidate is the solution for the third Cell.

Scan rows or columns to fill in larger squares.

Check for a number that's repeated 2 times in different squares. Run your fingers along the rows that contain that number. The third large square must contain the same number, but it can't be in 1 of the 2 rows you're tracing. It must be in the third row.

Another systematic Sudoku solver strategy is pencil marking which means you pencil in possible numbers inside cells after scanning rows, columns, and grids. This helps you in identifying combinations and later erase numbers that do not fit the solution. Always use a pencil to solve Sudoku.

Look for numbers that can only go in one place: if you see a number that can only fit into one slot on the sudoku grid, then it goes there! For example, if the only possible place for the number 1 is in the middle of a row, then that's where it goes.

Puzzazz is the best way to solve Sudoku puzzles, including a free hand-crafted Sudoku puzzle every day.