Separate and put back together! True bonds has always been hard to form, but once formed such bonds are eternal and hard to break. This bond is truly difficult to unravel.
The key word is “Bond”.
Design: Mineyuki Uyematsu. Took part in 2007 Puzzle Design Competition. Level 6/6. Package size: 7,5 cm x 11,5 cm x 4,5 cm.