Abstract: A puzzle comprises a box formed by a sleeve and a drawer, similar to a matchbox, but with the sleeve closed at one end and open at the other end. The length of the drawer is equal to the interior length of the sleeve so that, when the drawer is inserted fully into the sleeve until its interior end abuts the closed end of the sleeve, the open end of the sleeve is closed by the outer end of the drawer, giving the appearance of a box with similar end panels. The edge of the sleeve at the open end has indents in at least two of its opposite faces. The drawer has corresponding protrusions which correspond exactly to the indents. When the drawer is fully inserted, the protrusions fill the indents and complete the respective surfaces. To open the box, the protrusions are grasped between finger and thumb and pulled outwards. Preferably, the box is shaped like a crate with longitudinal parallel slats simulating plank pieces and transverse slats simulating strapping.