Cast DOT is a delightful introduction to the wonderful world of mechanical puzzles. DOT stands for: direction, orientation, twist, which is exactly what you’ll need to do to navigate this attractive three-dimensional matrix and separate the two metal pieces. DOT is an unusually alluring pocket puzzle because its combination of low-level difficulty and high-level play value appeals to beginners but also, advanced puzzlers, who consider it more of a clever fidget toy. More difficult to put back together than to take apart but still relatively easy when compared to other Akio Yamamoto designs like Vortex. Produced by Hanayama of Japan.