SU-DO-KU

Sudoku is a simple though addictive arthimatic Japanese puzzle. In this there is a grid of Matrix 9 x 9. Initially when the puzzle is put forward, some of these grids are filled with numbers from 1 - 9. The objective of the puzzle is to fill the empty grids with numbers from 1 - 9 with the following constraints:
1. No two numbers in each row should be the same.
2. No two numbers in each column should be the same.
3. If the 9 x 9 grid is split into 9 3 x 3 grids, No two numbers in each such 3 x 3 grid should be the

It's fun. It's challenging. It's addictive!

Sudoku sometimes spelled Su Doku, is a logic based placement puzzle. The aim of the canonical puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9×9 grid made up of 3×3 subgrids (called "regions"), starting with various digits given in some cells (the "givens"). Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability. Its grid layout is reminiscent of other newspaper puzzles like crosswords and chess problems. Although first published in 1979, Sudoku initially became popular in Japan in 1986 and attained international popularity in 2005.

Sudoku stimulates the mind and logics, exists in each and every one of us. Studies shows playing Sudoku, improve memory, mind clariity

So, the Sudoku concept was not invented in Japan as many people may believe, In 1984 Nikoli, Japan’s leading puzzle creating company, decided to present the PUZZLE to their Japanese puzzle fans. The puzzles, which were first named Suuji Wa Dokushin Ni Kagiru, ("the numbers must be single" or "the numbers must occur only once") quickly became popular.

In 1986, Sudoku became one of the best selling puzzles in Japan. Kaji Maki, the president of Nikoli abbreviated it to Sudoku - (Su = number, digit; Doku = single, unmarried).