The New Secret Box 4 from the Karakuri Creation group is the hardest of the series of new secret puzzle boxes.
Being binary it requires 32 moves to open and is a significant step up in difficulty from the other three boxes.
Made from magnolia and walnut this is a beautifully made puzzle.
It measures 80mm x 80mm x 80mm with an internal storage space of 32mm x 32mm x 37mm.
benmckie