Patent ID: 7677946

Claim:
An apparatus for developing human motor and mental skills in a user, comprising: a plurality of activity elements having substantially similar outer dimensions, replaceably connectable along a contact surface to form a grid, each activity element including at least one challenge element having at least one movable part connected to said activity element and operative to challenge a mental or motor skill, the challenge met when said movable part is moved in a predetermined direction; at least one of said at least one activity elements including a panel having an elongated channel; a dial rotatably maintained within said channel; indicia disposed upon said panel about the circumference of the dial; means to retain said dial in rotatable disposition at one end of said channel; means responsive to a position of said dial, operative to release said means to retain, whereby said dial may be moved to another position within said channel, when a predetermined dial position is set; wherein activity elements are replaceable with other activity elements having different challenges, to maintain interest, or to increase a challenge as a user develops.