Hanayama Cast Dial (Level 5) is a sleek little metal puzzle with a big-brain twist: turning the dials on both the front and back is how you unlock the solution. Your goal is to separate all four pieces, but the real fun is learning the right sequence and getting everything back together once it finally comes apart. Designed by Vesa Timonen (Finland) and made with Hanayama’s satisfyingly solid build, this one lands squarely in “tough but irresistible.”