Screenshots:

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Easy to use interface to help you navigate around the sudoku grid:

Use the keyboard or mouse to navigate around the sudoku puzzle grid. You can enter numbers using the keyboard and mouse too. The Pen mode can be used to enter a number into a cell if you are sure of the answer. Use the Pencil mode to enter more than one number into the cell (notes) if you are unsure.

The rules of Sudoku-X puzzle are similar to standard sudoku but the diagonals (or gray "X") must also contain the numbers 1 to 9 only once. This adds another dimension to the already challenging game!

If Sudoku and Sudoku-X are still too easy for you then try our tridoku game. These puzzles are split into triangles instead of squares but the rules are very similar to standard sudoku.