Abstract: In order to enhance the enjoyment of assembling a puzzle of the three-dimensional type, a puzzle is disclosed in the form of a building-like structure having walls to be joined at corners thereof. The puzzle includes a plurality of wall pieces capable of interlocking in a plane to form walls of the building-like structure. It is also contemplated that each of the wall pieces will have peripheral male and female contours capable of interlocking engagement to form a portion of a wall. The puzzle further includes at least one corner piece capable of joining a pair of walls at a corner of the building-like structure. It is also contemplated that the corner piece will be formed so as to have a groove in a backing material opposite an image-bearing outer surface of the same types which are also to be used for each of the wall pieces.