This is a brand new Calvin’s Square-1, also known as Cube 21. It is a puzzle similar to the Rubik’s Cube. Its distinguishing feature among the numerous Rubik’s Cube variants is that it can change shape as it is twisted, due to the way it is cut, thus adding an extra level of challenge and difficulty.
It is made of ABS plastic, and has PVC stickers. The total weight is 120g.
Dimensions : 57mm x 57mm x 57mm
This puzzle comes fully assembled from the factory (but may or may not be stickered, in which case a set of stickers will be provided). Note that lubricating and working in the cube improves its performance. It is highly suggested to lubricate the cube to make it move more easily.