The cube unravels, staying in 1 piece like a snake. Can you get it back to the cube? A Great puzzle that stays in one piece so there are no pieces to lose. Good initial solution time is about 1 hour, but with practice this can be done very fast (under 10 secs) and made to look deceptively easy - thus has a high "showoff" factor:) These premium models have beveled edges on each of the 27 cubes that make up the snake. This gives an attractive and comfortable feel in the hand.