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Twisting Puzzles
Curvy Copter
The Curvy Copter is a variant of the Helicopter Cube where the cuts are curved. This adds an extra piece at the centre of each edge which has two orientations. If you line up an edge just right, you can jumble the puzzle into an odd shape, making the puzzle a lot harder to solve.
The extra edge piece makes this puzzle slightly harder to solve than the Helicopter Cube. That said, with a little intuitive solving, you can use your Helicopter algorithms and general approach to solve the puzzle. If you jumble the puzzle, just like the Helicopter Cube and Clover Cube, you need to put pieces back into their correct orbits in order to be able to solve the puzzle. With a little bit of patience, you can work out some techniques that use a quick jumble/unjumble algorithm to swap the orbits of the pieces.