Karst-Phenomenon-cube-by-Brian-Young-&-Karst-Nauta
Craftsman: Brian Young
Designer: Karst Nauta
A really cool puzzle, it’s two halves that need to come apart. They are held together by a very clever lock. One could stumble upon the solution once or twice by accident. But you would not be able to open it on command if you don’t know what you are doing.