Abstract: An incentive producing apparatus having a symbol displaying device, a player actuated device for changing the symbols on the displaying device, an accounting device for recording the changes in symbol displays caused by the operation of the player actuated device, and a processor responsive to the manner in which the player operates the device in such a way that the device responds to player input in the form of response time relative to the time of day or calendar time in order to adjust the operation of the apparatus to automatically, continually, proportionally, and subtly increase or decrease the difficulty of operation to maintain the incentive of the player to continue to operate the apparatus. The apparatus can be in the form of a slot machine game, an arcade game, a video action game or an education game. An embodiment of each type of such apparatus is disclosed.

Abstract: A teaching device for a sports implement (3,30,75,110) is disclosed including an electro-mechanical or electronic sensing device (1,35,84,116) incorporated in the sports implement (3,30,75,110) which interacts with the thing sported (5,36,90,119) to sense the configuration or proper or improper operation of the implement during actual play and by means of a signal or alarm (27,56,106,119) provide feedback of the configuration status to the sports participant.

Abstract: A device for limiting dorsiflexion past a chosen, optimum angle while permitting further forward flexion of the leg relative to the sport shoe contact surface. The device is advantageously used with a sport shoe including a sole, a shell mounted to the sole for receipt of the user's foot and an upwardly extending movable tongue or cuff mounted to the shell. The sole includes an upper foot supporting surface. In one embodiment the tongue is positioned so that dorsiflexion of the user's leg causes the tongue to move forward. The tongue is coupled to the upper foot supporting surface so that dorsiflexion between an initial angle and an optimum angle is relatively unrestrained but further dorsiflexion past the optimum angle is minimized or eliminated by the concurrent lifting of the upper foot supporting surface. In another embodiment the sole is a unitary member and the upper foot supporting surface is a part of the sole. In this embodiment a tongue assembly stops dorsiflexion past an optimum angle.

Abstract: An incentive producing apparatus having a symbol displaying device, a player actuated device for changing the symbols on the displaying device, an accounting device for recording the changes in symbol displays caused by the operation of the player actuated device, and a processor responsive to the manner in which the player operates the device in such a way that the device responds to player input in the form of response time relative to the time of day or calendar time in order to adjust the operation of the apparatus to automatically, continually, proportionally, and subtly increase or decrease the difficulty of operation to maintain the incentive of the player to continue to operate the apparatus. The apparatus can be in the form of a slot machine game, an arcade game, a video action game or an education game. An embodiment of each type of such apparatus is disclosed.