3D is the originality of the product. Recommended for 12 to 99 years on the package, my 12 year old daughter did it in about 2 hours. His regret: the parts are numbered, so just follow suit the following numbers and this makes lose interest in the puzzle appearance. At the same time it recognizes that without this it would be extremely difficult, as the piece are similar, shape and color. The result is nice, a bit fragile (and attention to household cat who passes by, the floors fall easily) to do more to expose the result that for the sake of it, quite limited.