## How many Sudoku puzzles are possible?

6,670,903,752,021,072,936,960 possible
There are 6,670,903,752,021,072,936,960 possible solvable Sudoku grids that yield a unique result (that’s 6 sextillion, 670 quintillion, 903 quadrillion, 752 trillion, 21 billion, 72 million, 936 thousand, 960 in case you were wondering). That’s way more than the number of stars in the universe.

## How many a Sudoku game has cells in total?

nine cells
Because each row, column and 3×3 box contains nine cells, each of the numbers one through nine will be used exactly once in each row, column or box. Although most sudoku puzzles use numbers, any set of nine characters or symbols can be used.

Are there many versions of Sudoku?

The Mammoth Book of New Sudoku: Over 25 different types of Sudoku, including Jigsaw Sudoku, Killer Sudoku, Skyscraper Sudoku, Sudoku-X and multi-grid Samurai Sudoku.

How many 9 9 Sudoku are there?

6670903752021072936960
Then they multiplied this number by 9! to get the answer. They discovered that the number of possible 9 by 9 Sudoku grids is N=6670903752021072936960 which is approximately 6.671×1021.

### What is the hardest Sudoku?

AI Escargot
Tough, tougher, toughest When Inkala developed the AI Escargot in 2006, he said, it is “the most difficult sudoku-puzzle known so far.” “I called the puzzle AI Escargot, because it looks like a snail. Solving it is like an intellectual culinary pleasure. Escargot claimed the top spot for sudoku’s most baffling puzzles.

Why is Sudoku bad? Sudoku puzzles might give your brain a good workout but they could add inches to your waistline. Anyone who taxes their brain on the number grid, as well as taking on crosswords and other word games, could be using up energy needed to exercise, psychologists claim.

A brain game like sudoku, as well as crossword puzzles, taking classes, reading, and writing, can help delay dementia and Alzheimer’s disease, and protect the brain from decline. And, says Snyder, while it offers good exercise and stimulation for the brain, sudoku can actually be very relaxing.

How many solutions are there to a Sudoku?

Most Sudoku puzzles published have only one solution. If there is more than one solution, it is probably a mistake. That said, puzzles with incomplete clues can have multiple solutions. In the extreme case, a puzzle with no clues has 6,670,903,752,021,072,936,960 solutions according to Wikipedia.

#### How many squares are there on a standard Sudoku grid?

Unlike the three-dimensional Rubik’s cube, a Sudoku puz- zle is a ﬂ at, square grid. Typically it contains 81 cells (nine rows and nine columns) and is divided into nine smaller squares containing nine cells each; call them subgrids. The game begins with numbers already printed in some cells.

#### What solving strategies are there for sumdoku?

What solving strategies are there for sumdoku? Many of the solving strategies for sumdoku are the same as for normal sudoku. For a start, you can apply the usual rules such as each number from 1 to the dimensions of the puzzle must occur once in each row and column. Therefore if there is only one place in a region where a number can go, then it must go in that location.

How many different Sudoku puzzles are there?

Some thoughts on how many possible Sudoku puzzles there actually are. On the web site the history page http://www.sudokudragon.com/sudoku.htm gives the total number of different Sudoku puzzles as 6,670,903,752,021,072,936,96.