Kisai Sudoku Watch Concept Tokyoflash Design Studio, Quite simply, the actual watch face is a game of Sudoku. The actual missing numbers need to be solved to learn the time. Your display is LCD & features might include date, alarm, EL backlight. The touch screen could be used to reveal the answers. Regarding people who enjoy puzzles & particularly Sudoku, its an excellent way to keep your own brain stimulated during the day.