Hanayama Cast Puzzle: Radix (Level 5)

Interlocking roots, branching in three dimensions.

Rated Level 5 of 6 on Hanayama's difficulty scale — genuinely hard — expect to put it down and come back to it.

Hanayama's Huzzle Cast series is the benchmark for mechanical puzzles — solid cast metal, no instructions in the box, and a single instruction: take it apart, then put it back together. The reassembly is always the harder half.

Pocket-sized, satisfyingly heavy, and it will be picked up by everyone who walks past your desk. Solutions are available from Hanayama if you need them, though most people hold out longer than they expect to.

Perfect for: desk fidgeters, puzzle collectors, Secret Santa, and anyone who claims to be good at this sort of thing.