Online Logical Puzzle Classic Sudoku

Sudoku is a placement puzzle. This is our 2ed version. The aim of the puzzle is to enter a numeral from 1 through 9 in each cell of a grid, most frequently a 9×9 grid made up of 3×3 subgrids (called regions), Note that our puzzle is in this form. You are given starting numerals in some cells. Each row, column and region must contain only one instance of each numeral. These puzzles range from easy to very hard.