Meffert's Gear Ball Puzzle Construction Toys with a door which can

with a door which can be opened and shut

32-page manual covers microscope setup

03" (77mm)

And Sis's light-up

and math (STEM) concepts as they use memory skills to overcome obstacles that nemesis Crusher has put in their path

Meffert's Gear Ball Puzzle Construction Toys with a door which canDeveloped by one of the World's leading puzzle inventors, the Meffert Puzzles create a challenge that will leave your head spinning. There are 5 styles of this unique series. Collect them all. The Gear ball puzzle is a six sided sphere of interlocking gears and requires you to get a solid color on each side to solve. Developed by one of the World's leading puzzle inventors The Meffert Puzzles create a challenge that will leave your head spinning 5