Sudoku is a logic-based puzzle game. A Sudoku is a Latin square additional property without repeating any value in any of the nine blocks of contiguous 3×3 cells. The basic thing in the solving the problem in Sudoku puzzles on n2 × n2 boards of n × n blocks is known to be NP-complete.

The most popular approach is to quickly solve the Sudoku puzzle is programming an application of dancing links in the game, with results in milliseconds for a 9×9 Sudoku puzzle. Though it does not tell how hard the puzzle will be for humans.

A general Sudoku puzzle has 81 cells, in a 9 by 9 grid and have 9 zones, every zone being the intersection of the first, and the middle, and the last 3 rows, and the first, and the middle, or last 3 column of the puzzle. Each cell contains a number from one to nine and each number may only occur once in each zone, each row, and column of the grid it has.

In the starting of the game, some cells start with numbers in them, and the goal is to fill in the other cells. The player can use a broad range of strategies to solve the puzzle and this article runs over a number of methods for doing this.

**Backtracking algorithms:**Backtracking algorithm is adapted to solve the Sudoku puzzle that gives all the possible solutions to solve the given Sudoku game. If the solving solution assigned does not lead to the solution of Sudoku then the algorithm dismisses the solutions and gets back to the original solutions and retries to solve it again.**Exact cover problem**: Sudoku can be described in an instance of the exact cover problem. It provides both for a stylish description of the problem and a quick solution using a backtracking algorithm. Meanwhile exact cover does not give guarantee efficient solution times for large grids administration of Sudoku using algorithms for exact cover, like Dancing Links which typically solve 9×9 Sudoku grids in minimum calculation time.

Sudoku software is very famous on websites, PCs, and mobile phones. It comes with so many distributions of Linux. Software released on video game consoles, like the PlayStation Portable, Nintendo DS, the Nook e-book reader, Kindle Fire tablet, several iPod models, and the iPhones.

Many smartphones have Sudoku.

It is a game of logic puzzle which people like so much that they don’t want to leave it for a while. It is the puzzle that exercises the brain which is very good for a person.

It is now popularly famous in many countries. It is a puzzle game for all the age of people a kid can solve the puzzle and the adults are of deep interest to play it.

People are indulging in it so much that he starts the Sudoku game as he wakes up in the morning. It is a number based puzzle so there is no language problem in it.