Abstract: A children’s puzzle including a rigid frame and a set of removable, rigid, non-interlocking pieces. The rigid frame has two opposite broad sides defining a thickness with multiple recesses which are sized to simultaneously accommodate all of the pieces of the set. Each recess is surrounded by one or more elevated surfaces of the rigid frame. At least one of the recesses on at least one broad side of the rigid frame loosely contains multiple pieces of the set. The recesses of the two opposite broad sides of the rigid frame are arranged differently, so as to form respective arrangements of the pieces of the set when accommodated in the recesses. The pieces each have a flat bottom surface. At least three of the pieces have different perimeter shapes. The pieces are retained in the recesses only by gravity.