Diamond #33 - Challenging Burr Puzzle – Kubiya Games
Circular Ball - Wooden Puzzle 3 → MasterCubeStore
Tennis Ball - Interlocking Wooden Puzzle - Solve It! Think Out of the Box
Amazon.com: Thoth Montessori Multiple Circle Puzzle Board Knob Wooden Puzzle Geometric Shape Puzzle Early Education Material Sensorial Toy for Toddler Shape & Color Sorter (Multiple Circle) : Toys & Games
4 Circles - Brain Teaser Puzzle for Kids – Kubiya Games
Game Ball Wooden Brain Teaser Wood Puzzle Assembly - Etsy