Abstract: Toss game targeting structures (e.g., an airmail box) disclosed herein are adapted to mount on a gameplay surface of a regulation gameplay (e.g., cornhole) board that is lying flat on the ground. Such mounting is preferably achieved through engagement of one or more structural elements of a toss game targeting structure with the gameplay hole of the cornhole board. Preferably, such toss game targeting structures can include one or more structures that engage a mating portion of the cornhole board for limiting or preventing unrestricted rotational movement of the structure relative to a gameplay, can include a gameplay surface that is at a pitch nominally the same as a regulation pitch of a cornhole board and can have a gameplay hole in the gameplay surface that is a distance above the ground nominally the same as a regulation gameplay hole position of a cornhole board.