Sudoku (Japanese: sodoku), also known as Number Place, 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. Although first published in a U. S. puzzle magazine in 1979, Sudoku initially caught on in Japan in 1986 and attained international popularity in 2005.

The best way to solve a Soduku puzzle is to start off going through and writing in the numbers that you can pin down immediately to an exact location.
If you go through the rows one by one, and try to work out where each number could go, you can have immediate success.