Two puzzles sharing one body and arguing constantly. The Son-Mum concept hides a smaller puzzle inside a larger shell: here a functioning 4x4 lives entangled within a 3x3 exterior, and mixup-style forty-five-degree slice turns pull inner pieces to the surface and back.

Solve them independently when aligned, or together when the layers interleave - at which point bandaging and shape-shifting transform the challenge entirely. Designed by Mike Ambrust and manufactured by mf8 with the brand's usual over-engineered solidity.

Advanced collectors only: reviews warn of stiff break-in and corners that separate under force, superglue recommended. Worth it for the concept alone.

Features:

• Nested dual-puzzle architecture
• 45° mixup slice turns exchange pieces
• Solvable separately or interlocked
• Advanced collector difficulty