This game Called Rittai Kakushi e Attakoreda in Japan, this Nintendo DSiWare game utilizes both of the console’s cameras. Payers must locate hidden objects and form letter shapes by tilting the DSi, and, in turn, the game world.
Movements are tracked by processing the input from multiple camera phones. To move the camera, gamers simply play DSI to the left and right, or by tilting it. All of this can be done because of the dual sensor camera that will detect all the movements that gamers do.

This application is a pretty cool feature and unique to be used. Can be downloaded game for, but right now for Japan only.
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