The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid (also called 'boxes', 'blocks', or 'regions') contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
Sudoku game strategy
DESCRIPTION:
"Sudoku (yap.数 独 su: doku) - a puzzle with numbers. Sometimes sudoku is called a magic square, which is generally incorrect, since sudoku is a 9th-order Latin square. Sudoku is actively published by newspapers and magazines around the world, Sudoku collections are published in large numbers. But it became especially popular to play Sudoku online. Sudoku is a popular leisure activity.
In the 18th century, Leonard Euler invented the game Carré latin (Latin Square). Based on this game, special numerical puzzles were invented in North America in the 1970s.
So, in the USA, sudoku appeared for the first time in 1979 in the Dell Puzzle Magazine. Sudoku gained real popularity in the 1980-1990s, when the Japanese magazine ""Nikoli"" began to regularly publish this puzzle on its pages (since 1986). Sudoku is an essential component of many newspapers today. However, the most popular was the decision to sudoku online."
In the 18th century, Leonard Euler invented the game Carré latin (Latin Square). Based on this game, special numerical puzzles were invented in North America in the 1970s.
So, in the USA, sudoku appeared for the first time in 1979 in the Dell Puzzle Magazine. Sudoku gained real popularity in the 1980-1990s, when the Japanese magazine ""Nikoli"" began to regularly publish this puzzle on its pages (since 1986). Sudoku is an essential component of many newspapers today. However, the most popular was the decision to sudoku online."
How to play
Control buttons:
choose a difficulty level (Sudoku has 6 difficulty levels)
restart (start the game from the beginning)
step back
sudoku rules/pause
sudoku print
In addition to choosing a number, you can show possible numbers
Sudoku game strategy
1.There cannot be two identical numbers in one row and one column. So, if there is only one cell left in a small 3*3 square that does not have a number vertically or horizontally that we are checking, then this number is in this cell.
2.We remove possible numbers in the cell, avoiding repetition of numbers in each row, in each column and in each small square 3×3
3.If there are few empty cells left in any row, column or small square, put the possible numbers
4.If there is possible number only in a row or column of a small square, then it will not be in other rows or columns of small squares, respectively
5.If there are only two possible numbers in two cells in a row, column or small square, or three possible numbers in those cells, etc. then these numbers are not possible in other cells of this line or column or small square
6.If no options are visible, then substitute a number and check (usually, where there are only two possible numbers) whether the assumption is correct. If the assumption is not true, another number is true
An example of a sudoku solution
SUDOKU
1.There cannot be two identical numbers in one row and one column. So, if there is only one cell left in a small 3*3 square that does not have a number vertically or horizontally that we are checking, then this number is in this cell. Therefore, in the given example, the number 6 can only be in a darkened cell
The same for 5
The same for 4, 6, 8
2.We remove possible numbers in the cell, avoiding repetition of numbers in each row, in each column and in each small square 3×3
We choose the cell in our opinion with the smallest amount of possible numbers
We delete the numbers that are already in the row:
We delete the numbers that are already in the column:
We delete the numbers that are already in the small 3×3 square:
So only 7 can be here:
3.If there are few empty cells left in any row, column or small square, put the possible numbers
in the column 3: 2 empty cells:
but we already have 1 in the row
So only 9 can be here:
and So only 1 can be here:
We done it for other cells
and So only 7 can be here:
We remove possible numbers in the cell, avoiding repetition of numbers in each row, in each column and in each small square 3×3 a 7 from the possible numbers:
and So only 2, 7, 3, 2, 5 can be here:
4.If there is possible number only in a row or column of a small square, then it will not be in other rows or columns of small squares, respectively
In the second small square from the top, 3 is possible only in the first row. So, in the first square, 3 will be in the second row.
5.If there are only two possible numbers in two cells in a row, column or small square, or three possible numbers in those cells, etc. then these numbers are not possible in other cells of this line or column or small square
So only 2, 8, 9 can be here in the row
And So only 1, 5, 7 can be here in the small 3×3 square:
and in the column:
and in the column:
and in the row:
6.If no options are visible, then substitute a number and check (usually, where there are only two possible numbers) whether the assumption is correct. If the assumption is not true, another number is true
So only 7 can be here:
We remove possible numbers in the cell, avoiding repetition of numbers in each row, in each column and in each small square 3×3:
And
CONGRATULATIONS
SUDOKU RULES AND STRATEGY | Sudoku Free Online | Print Sudoku | No install or registration
choose a difficulty level (Sudoku has 6 difficulty levels)
restart (start the game from the beginning)
step back
sudoku rules/pause
sudoku print
In addition to choosing a number, you can show possible numbers