Curvy Copter Plus Mefferts Black Puzzle Cube Twisty Toy Gift by TomZ The Curvy Copter plus is the next step up from the regular Curvy Copter This puzzle added 24 additional face pieces that can interchange with the corner pieces Difficulty Level: Hard , Smooth turning puzzle Stickers: Orange/Yellow, Red/Purple, Green/Blue Curvy Copter plus produce more interesting and beautiful face pattern, it also makes the jumbling feel less constrained