This is Rittai Kakushi e Attakoreda, a DSiWare game that makes brilliant use of the Nintendo DSi's built-in cameras to control an in-game camera that lets the player explore a 3D diorama to find hidden objects.
The downloadable game, right now for Japan only, comes courtesy of Wario Land: Shake It! developer Feel-Good. As one can see in the preview video above, players must locate hidden objects by tilting the DSi, and, in turn, the game world.
Rittai Kakushi e Attakoreda [Nintendo Japan via BoingBoing/TinyCartridge]


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