Russian Balls - 9-Level

Ever heard of Russian nesting dolls?  Well this is Russian nesting balls.  Based on an original design from Stewart Coffin (called the Pennyhedron), this simple nesting puzzle requires you to figure out how to open the little "ball" to reveal another smaller version of the same inside. 

The method of opening it isn't hard, but definitely counter-intuitive!  This puzzle contains 9 different colored 12-sided "balls".   Made in 3d printed plastic by Lee Krasnow, demonstrating the accuracy of this 3D printed wonder!  The tiniest ball measures only 1 cm!