Sudoku puzzles

Sudoku is a nine-to-nine chart showing the numbers from 1 to 9. The 9x9 chart is again subdivided into 3x3 box. In each box, a number from 1 to 9 must be entered.
To solve the puzzle, the boxes must be filled in so that in each row, each column and each 3x3 box, the numbers 1 through 9 appear only once.

You do not have to be a really smart person, you need just a little patience and logsich reasoning to solve the puzzle.