Kepler by Felix Ure
The aim is to put all 11 balls inside the enclosure, then insert the lid.
A pocket-sized packing puzzle that seems very simple, until it isn't.
Machined from solid aluminium and brass, Kepler measures 55mm x 31mm x 33mm, and weighs 155g in its solved state.
If you're stuck on a puzzle, email email@example.com and ask for a clue.