Sudoku Generator, an addicting logic number puzzler

From wikipedia.org: Sudoku (数独, sūdoku) is a logic-based number placement puzzle.
The objective is to fill a 9×9 grid so that each column, each row, and each of the nine 3×3 boxes (also called blocks or regions) contains the digits from 1 to 9, only one time each (that is, exclusively).
Also try another online Sudoku.