From the Super Mario Wiki
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The purpose of the game is to tilt the Game Boy Advance to divide the people and the animals that fall into the hand to their proper side.
A minimum of 15 points must be earned to clear this microgame.
The player can get a combo if three members of the same species are placed into their area side. But if a member of a species is placed into the wrong area side or a species falls on the hand when another one is present on it, the sky will turn dark, lightning will strike the two areas and the player loses the game.