Six-Piece Interlocking Puzzle - Hard Difficulty

angular art assemble brain brainteaser burrpuzzle challange classic construct desk display durable easy entertainment fidget filament game geometric gluefree hard hexagon interlockingpuzzle iqpuzzle lowfilament mechanical medium mindgame mini novelty polygon print printable puzzle red relax sculpture sensory shape singleplayer small smooth square star stress symmetry teaser test toy triangle