Each game starts with given numbers placed in different boxes. Complete the puzzle by filling out the rest of the boxes with numbers. Make sure that every row, every column and every 3x3 box contains the numbers 1 through 9 without repeating any of them!

Game Controls: By default, you'll play the game with your mouse. Click a box in the grid and select any of the numbers 1-9 or the "x" to clear the box or cancel your input. If you select "Keyboard" in the "Input Mode" box, you'll play the game with your keyboard. Use the arrow keys on your keyboard to select a box and type any of the numbers 1-9 on your keyboard.

Enable the "Pencil Marks" feature to mark numbers that could go in a box. This should help you solve the puzzle when it gets difficult!