Sudoku Wear 4×4 for Apple Watch
Sudoku is a wonderful game to play as it can give your brain a good workout without getting old. Thanks to Sudoku Wear 4×4, you can try it on your Apple Watch. This app has 3 game modes, with numbers, colors, and images. You can simply play by tapping on each cell. Each mode has 3 levels.
This app uses dark colors not to drain your battery. It is available for under $1 at this time.