Above cells are organized into boxes. In the case of a 9x9 Sudoku, there are nine boxes, each containing nine cells. These are arranged as 3x3 boxes in classic Sudoku puzzles. However, in other sudoku varinates, such as chaos sudokus, a box may have other shapes.

The Sudoku game board is the entire Sudoku with all boxes and cells.

A cell can either be a default or already solved by the player. In this case, it is revealed. All other cells are hidden and must be solved by the player.

A single cell can be marked with the selection cross. By clicking on a cell that has not yet been revealed, the selection cross is displayed. Clicking on the same cell again will hide it again.

For some Sudoku variants such as Jigsaw or Chaos, the box in which the marked cell is located will also be highlighted in color with one click.

By marking it with the selection cross, the selected cell becomes the active cell. This will apply all inputs to that cell.

Any cell that does not yet have a solution and is hidden can have a note added to it in the form of a possible solution. When a cell is solved, the notes for that cell and all cells related to it (by boxes, rows or columns) are removed. Notes are displayed as small values in the cell.

If a cell is highlighted and note mode is activated, the possible solutions for this cell that have already been noted are highlighted in the buttons.

The number wheel can be activated by clicking and holding on an uncovered cell. Without interrupting the click, you can then select a number as the solution by swiping over the desired number and ending the click.

The Notification Sounds, Error Sound, and Vibration settings allow you to customize the way you receive feedback while solving the Sudoku puzzle.

Note: Vibration is only available on devices that support this feature. Alert tones only play when the device is not in silent mode or you are using headphones.

You can use the playing field size settings to set a zoom factor. This is helpful if you want to make better use of your device's screen. On mobile phones, the maximum zoom level is often already reached at the 1:1 setting. However, on larger screens the playing field can be zoomed up to twice the size.

When you completely solve a box, column or row, your combo factor increases. If your next solved cell doesn't complete a box, row or column, it's lost again. Therefore, make sure to enter the final cells at the end of the game to earn extra points.