Polyhedra are beautiful 3-D geometrical figures that have fascinated philosophers, mathematicians and artists for millennia. On this site are a few hundred paper models available for free.

Make the models yourself.

Problem Solving - 25 visual challenges to complete

Creative Thinking - There are no instructions!

Logical Reasoning - Some puzzles can be solved systematically

Spatial Reasoning - Visualize in your mind

Tinkercad is an easy, browser-based 3D design and modeling tool for all. Tinkercad allows users to imagine anything and then design it in minutes.