This masterpiece of logic and self-development can be put on the pedestal next to the chess and Rubik's cube. Eternally problematic course of events when people can not to do, but not as staroobryadno spark delight - do a simple push of the cubes from the lower position to the top, but on condition that they will not move on one and if there is an extended close it down - go for it and a huge Good luck, and I was blown away with the first five minutes of the game!