INVERSE: STRATOSFEAR - Difficulty level - Very Hard. Launch your puzzle-solving skills into the Stratosfear. The irregular segments twist on various degrees of axes, elevating the challenge. The cube is a mono chromatic blue, so there are no color variations to guide you. It ranks as the highest difficulty level in the Inverse collection. Each twisty puzzle in the Inverse line is designed with a unique shape and solving mechanism. These puzzles also look great on a shelf when not in use - the cleverly designed hinged packaging functions as a display case for your Stratosfear between bouts of puzzle play. The brightly colored packaging makes it a great gift ? especially for teens! PROJECT GENIUS: Designed by Project Genius, a U.S.-based, woman-owned business, proud to excel as a leading manufacturer of innovative mechanical puzzles and strategy games. We are honored to support a dedicated work program for young adults with Autism, empowering them to contribute their unique talents to our creative endeavors. Your purchase goes beyond the puzzle ? it extends to making a positive impact on our inclusive and diverse community. Thank you for being a part of our story!