A sophisticated and eye-catching version of the traditional clock puzzle is the C4U 5x5 Clock (Stickerless). It is a 5x5 clock face grid with blue and lavender clock faces on opposite sides. Because each of the 16 pins influences the four nearby clocks, the puzzle is intricately linked and difficult to solve. This puzzle is ideal for collectors and experienced solvers seeking a distinctive challenge to add to their collection because of its intricate mechanism and distinctive design.