# How many 6×6 sudoku puzzles are possible?

## How many 6×6 sudoku puzzles are possible?

6,670,903,752,021,072,936,960
Fortunately, due to the power of math, you don’t need to wonder that any further: There are an eye-popping 6,670,903,752,021,072,936,960 possible solved Sudoku grids.

## How do you know if a Sudoku is right?

Check if the rows and columns contain values 1-9, without repetition. If any row or column violates this condition, the Sudoku board is invalid. Check to see if each of the 9 sub-squares contains values 1-9, without repetition. If they do, the Sudoku board is valid; otherwise, it is invalid.

## How to solve extremely hard Sudoku puzzles step by step?

Look for a single empty in a larger square. Check each square to see if it has a single square open.

• Check for singular empty squares in the rows and columns. Run your finger down each row and column to see if any of them only have 1 square open.
• Scan rows or columns to fill in larger squares.
• Work in groups of numbers.
• ## How to win at Sudoku?

“The best Sudoku players know how to cut through the visual clutter of a Sudoku grid and start scanning immediately for the most valuable clues and information that they need,” reports Sudoku.com. Other Sudoku players have the ability to “switch off their minds to the outside world and focus for hours to solve Sudoku puzzles.”

## How to play Sudoku for Dummies?

How to Play Sudoku? Sudoku Rule № 1: Use Numbers 1-9. Sudoku is played on a grid of 9 x 9 spaces. Within the rows and columns are 9 “squares” (made up of 3 x 3 spaces). Each row, column and square (9 spaces each) needs to be filled out with the numbers 1-9, without repeating any numbers within the row, column or square.

## How do Sudoku puzzles work?

Every square has to contain a single number

• Only the numbers from 1 through to 9 can be used
• Each 3×3 box can only contain each number from 1 to 9 once
• Each vertical column can only contain each number from 1 to 9 once
• Each horizontal row can only contain each number from 1 to 9 once