Patent ID: 8500509

Claim:
An entertainment device comprising: a fluid medium; an electromagnetic frame disposed adjacent to the fluid medium, said frame having a plurality of sides and an electromagnetic coil at each side; multiple mini-crafts, each simulating a miniaturized, propeller-driven vehicle including a propeller and being disposed within the sides of the frame, each said mini-craft comprising a magnet, each said mini-craft having a different cutoff frequency, said cutoff frequency being dependent on the shape and size of each said mini-craft and its corresponding magnet; a controller in the form of a manual game controller for user control, said controller enabling entertainment of said user of said entertainment device wherein said controller provides a direct manual interface of said user with each said mini-craft so as to selectively move and maneuver each said mini-craft within said fluid medium through a variety of different kinds of landscapes, tunnels, obstacles, and target points; a communication port adapted to receive multidirectional navigation signals from said controller; a processor adapted to compute, based on the multidirectional navigation signals, electromagnetic signals for each coil in the electromagnetic frame, said processor being adapted to compute superimposed electromagnetic signals to separately control each said mini-craft based on its cutoff frequency; and rotating magnetic fields and gradients selectively formed by said electromagnetic signals acting upon the coils whereby the rotating magnetic fields and gradients cause the propeller of each said mini-craft to rotate and thereby maneuver each said mini-craft within the fluid medium and move in the directions indicated by the navigation signals.