From the Super Mario Wiki
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In the game there is a man with a pair of chopsticks looking at a fly which is moving around slowly. If anywhere but the fly is tapped, the man will move his hand very fast and a few special effects will appear on-screen until the fly is tapped. When it is tapped, a box will appear in front of the fly, with a close-up of the fly in the chopsticks and the word "GOTCHA!". If the fly is tapped, the game will be won. If the fly is not tapped, the game will be lost.