three dimensional - Need help solving 3d wooden cross puzzle - Puzzling Stack Exchange
Chinese Cross, Six-piece Burr 3D Wooden Brain Teaser Puzzle, Burr Puzzle, Wood Puzzle, Brain Teaser, 3D Puzzle, Mind Game, Educational Game - Etsy Singapore
Classic 6-piece IQ Wooden Interlocking Cross Burr Puzzle Game for Adults Kids - AliExpress
How to solve a nine piece wooden Burr Puzzle - YouTube