A variable-color region (106) of an information-presentation structure extends to an exposed surface (102) at a surface zone (112) and normally appears along it as a principal color. An impact-dependent portion (138) of the variable-color region responds to an object (104) impacting the zone at an object-contact area (116) by temporarily appearing along a closely matching print area (118) of the zone as changed color materially different from the principal color if the impact meets threshold impact criteria. Object-tracking apparatus (808) tracks movement of the object over the surface and provides an image-causing tracking impact signal when the object impacts the zone according to the tracking. An image-generating system (802, 842, 1152, or 1182) responds to at least the impact signal by generating a print-area vicinity image consisting of an image of the print area and adjacent area of the surface.

Disclosed is a method of playing a game. The method comprising providing a hexagon-shaped playing field with six boundary lines. Further, the method comprising providing a ball having the spherical shape similar to that of an American basketball. Further, the method comprising providing three baskets attached to three backboards attached to three poles, wherein each basket in the three baskets includes a net attached to a hoop, wherein each pole in the three poles is installed at three boundary lines in the six boundary lines respectively, wherein the three boundary lines are unconnected from each other. Further, the method comprising providing three teams of players comprising a first team of players associated with a first basket in the three baskets, a second team of players associated with a second basket in the three baskets and a third team of players associated with a third basket in the three baskets.

Disclosed is an indicating means that may be worn by a player or attached to a target when playing with non lethal projectiles to indicate when a player or a target has been struck by a projectile. The disclosed indicating means comprises a fabric containing sequins followed by a layer of padding beneath the fabric. Sequins are brushed into a first position at the start of game play. During game play, impact of a projectile onto the indicating means will be absorbed by the padding creating undulations radiating outwards from the point of impact causing the sequins to flip to a second position indicating that the player or target has been struck. The disclosed indicating means will work with any projectile, does not require an electrical charge to operate, is low cost, reusable, and durable.

A tackle training system defines a frame configured for attachment to a player's body. The frame has an upper portion, a lower portion, and a center portion extending therebetween. The upper portion defines at least one attachment structure extending downwardly toward the lower portion, and the lower portion defines at least one attachment structure extending upwardly toward the upper portion generally vertically aligned with the attachment structure of the upper portion. The opposing attachment structures are for contacting opposing ends of a bar so as to removably attach and extend the bar between the upper and lower portions. The attachment structures of the frame limit movement of the removable bar generally to that of the frame and allow release of the removable bar from the frame when a force that overcomes an attachment force provided by the attachment structures is applied to the removable bar.

Disclosed is system and method for measuring the tension of a tennis net, and, alternatively or in addition, for determining if a service let occurs via the measuring of the net tension. The disclosed embodiments measure a force exerted on the center-strap or the singles stick by the net. In these embodiments, the measured force provides an accurate reflection of the tension of the net.

A position or score indicator for a game such as swingball comprises a casing, moving score indicators 8,9 on opposite external sides of the casing, an internal gear drive system, and an external arm to which equipment for playing a game is attached and which when drives the internal gear drive system to move the score indicators to indicate player scores.

A variable-color region (106) extends to an exposed surface (102) at a zone (112) and normally appears along it as a principal color. The region responds to an object (104) impacting the zone sufficiently hard at an object-contact area (116) by providing an impact signal identifying a criteria-meeting area (1626) where threshold impact criteria are met. Responsive to the impact signal and possibly to supplemental impact criteria being met, a controller (1622) produces a representation of a print area (118) from a representation of the criteria-meeting area by smoothening its perimeter and provides an initiation signal designating a location in the zone for the print area such that it closely matches the object-contact area. An impact-dependent portion (138) of the region responds to the initiation signal and possibly to a tracking condition being met by temporarily appearing along the print area as changed color materially different from the principal color.

A tackle training system defines a frame configured for attachment to a player's body. The frame has an upper portion, a lower portion, and a center portion extending therebetween. The upper portion defines at least one attachment structure extending downwardly toward the lower portion, and the lower portion defines at least one attachment structure extending upwardly toward the upper portion generally vertically aligned with the attachment structure of the upper portion. The opposing attachment structures are for contacting opposing ends of a bar so as to removably attach and extend the bar between the upper and lower portions. The attachment structures of the frame limit movement of the removable bar generally to that of the frame and allow release of the removable bar from the frame when a force that overcomes an attachment force provided by the attachment structures is applied to the removable bar.

This disclosure describes a pressure-sensitive marking tape or paint for pickleball, pickleball courts formed using the marking tape or paint, and pickleball ball inbounds or out of bounds determinations using the marking tape or paint. The marking tape or paid is configured to, when set on the playing surface of a pickleball court, generate a visually detectable temporary localized variation, in the color or the like, of the marking tape or paint at the point of contact by a pickleball ball. The temporary localized variations enable clear determination of whether the pickleball ball is inbounds or out of bounds during game play.

Disclosed is system and method for measuring the tension of a tennis net, and, alternatively or in addition, for determining if a service let occurs via the measuring of the net tension. The disclosed embodiments measure a force exerted on the center-strap or the singles stick by the net. In these embodiments, the measured force provides an accurate reflection of the tension of the net.