The Square-2, invented by David Litwin in 1995, is a shape-shifting cube puzzle, evolving from the Square-1. Its split corners allow two solved states, with ~3.7 trillion combinations. Unofficial solves hit 20-30 seconds. Rotate top/bottom layers in 30° increments and slice the middle to swap halves. Solve by pairing corners to reduce to a Square-1, using algorithms like (1,0)/(0,1). A niche favorite, Hknowstore’s versions turn smoothly. On rubikverse.com, the virtual simulator offers an engaging way to scramble and solve this intricate puzzle anytime.