Kepler is the newest puzzle from designer Felix Ure! Machined from solid aluminum and brass, this intriguing design is a packing puzzle where the aim is to put 11 metal balls inside the enclosure and then insert the lid. (If the lid is not flat against the top of the box, you haven't solved it.) No external tools are allowed. It is a pocket-sized packing puzzle that seems very simple... until it isn't.
Comes packaged in a black felt bag tucked in a small black box.