Different Sudokus with filter option. If you click on a number in the filter box, you can see where that number can be placed and still create a valid Sudoku. Click on a number in the Setzen box to select the number you want to use for a Square. Click on Neues Spiel to start a new game.
How to play sudoku games:
There is really only one rule to Sudoku: Fill in the game board so that the numbers 1 through 9 occur exactly once in each row, column, and 3x3 box. The numbers can appear in any order and diagonals are not considered. Your initial game board will consist of several numbers that are already placed. Those numbers cannot be changed. Your goal is to fill in the empty squares following the simple rule above.