Searching for a challenge? The LanLan Rex Cube is a deep corner turning puzzle, in the family of the dino cube. Upon first impression, this cube looks quite simple to solve and remarkably similar to the skewb. However, this puzzle may be a little more challenging than you would think is harder to solve that you think. With its variety of curving edges, the Rex Cube has a smooth rotation that subtly clicks into place. This is one of our most popular products, with hundreds of people looking to get their hands on this interesting challenge.