This 3D jigsaw puzzle is one of several different models manufactured by Ravensburger. In my opinion it's the best one. Inside the box you will find 216 plastic jigsaw pieces, some of which are hinged and you need to bend slightly. There are also some plastic pieces that make up the walkway, roof and sails. There are two ways to put it together; you can either follow the numbers on the back of the puzzle pieces or you can assemble it as you would a normal jigsaw, looking at the front of the pieces. It's better to treat it as a normal jigsaw of course, but the numbers could help if you get stuck.
Once assembled, the model is very sturdy. It's not going to fall apart when you pick it up, and it's also easy enough to dismantle if you want to put it back in the box. The sails spin round with a push and it makes a very good model to display on a shelf. From a distance you can barely see the joins between the jigsaw pieces.