Are you an absolute expert in solving Sudoku? Then try the level "very difficult". At this stage only very few fields are specified. If you can easily solve these puzzles, try to improve on the time you need to solve Sudoku.
The goal of the game is to fill the 9 large blocks with the numbers 1 to 9 so that each digit appears in a column (vertical), in a row (horizontal) and in a block (3x3 cells) only once.
On our homepage you have the possibility to print Sudoku's in all levels (including solutions). More than that you will find useful background knowledge about Sudoku, as well as the rules and tips for solving the puzzles.