Abstract: An assembly for assisting in the instruction of court or playing-field games, e.g., tennis, the assembly having two-dimensional panels that are strategically positioned on a court. Each panel is made of a flexible, durable material that forms a plane for positioning and repositioning on the surface of a tennis court, thus permitting a tennis instructor to customize tennis lessons according to the specific needs, strengths, or weaknesses of a particular student player. For instance, when instructing a young child, the targeting devices can be moved to a forward position on the court in order to reduce difficulty and assure the positive feedback essential in teaching children. Each targeting panel may have weights attached to the lower surface of the panel to assure positioning in windy weather, or when the panel is repeatedly struck with tennis balls. With minor modification, the target assembly may be used as a training aid in volleyball, soccer, squash, badminton, paddle tennis, hockey, etc.