https://www.youtube.com/watch?v=u37b6poHzlU&pp=wgIECgIIAQ%3D%3D&feature=push-sd&attr_tag=uQkS5n8m7NTaT7SK%3A6
Interesting new puzzle. The inventor, Greg Pfennig has a long history of making fantastic twisty puzzles.
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