To play on mobile, simply tap the cell where you want to modify the value, and it will automatically increase its value. There are 3 levels of difficulty, and you can play both the traditional 9x9 sudoku and a reduced 4x4 version. For the watch, only the reduced 4x4 version is available. The design and playability are kept as simple as possible, specifically for the watch. Additionally, dark colors are used to minimize battery consumption. A sudoku game for Wear OS!