Project Genius Meffert's Hollow Brain Teaser Cube

This is a Meffert's Hollow Brain Teaser Cube that's produced by the good folks over at Project Genius. They make various levels of challenging puzzles! 

Project Genius uses a 5-star rating system for difficulty with 5 being the most difficult. The Hollow Cube has a rating of 3.5 stars making it one of the most difficult puzzles. The goal of this puzzle is to make each side has 9 unique colors.

Great for any fan of brain teasers! 

Recommended Age: 9+

Condition: Brand New