Smart cubes in a tray. 6 pieces. We are sailing, sailing, sailing

The set consists of 6 cubes measuring 4x4 cm. The child needs to assemble a picture from 6 fragments. As a clue, there are 6 pictures depicting water transport. The picture is placed at the bottom of the box, and... the child puts the necessary cubes on it. During the game, the concepts of "part and whole" are introduced, and the ability to work from a model develops. The stickers on the cubes are made from high-quality smooth paper that does not get damaged during play.
There is also a surprise for the child! If the picture is assembled and all the cubes are turned over, another picture will appear.