The Ubongo 3D is really great. For me as a madman Ubongo fan it was first totally surprised me, what the makers to come up with everything and could not imagine the game properly. After we bought it, we have very often played the game. One has to say that it is a really difficult game. It's just not the more difficult variant of the predecessor because you now no longer cover the predetermined area on one, but precisely on 2 levels with stones muss.Dies is sometimes quite a big challenge, but brings but the fun factor, because you often quite desperate is ;-) As with the other Ubongo games to get often to the point "The puzzle can be solved but not at all!", And a Long Try usually but then the solution is still. In the Ubongo 3D, which sets much on the spatial thinking skills, this is usually very difficult. But for a full game guide is placed ready, which I find really great. Other manufacturers have the strategy guide probably still sold separately or so. It is often very useful! I could imagine already (have not tried it yet) that the game challenging for (younger) children and is valuable, but I think it's a bit unfair, because the adults may have probably still faster. But it's great for training the spatial imagination. It's a really challenging game for the thought power, but I find it, just like its predecessor, is a really great game, but is more what advanced or even professionals :) All in all I am very satisfied, because the stones are very sturdy, so they can not be kinked or so, which is indeed the case in many games. Super Game!