From the Super Mario Wiki
The player controls a person that constantly blows air in front of them. The objective of the game is to blow out all the candles by tilting the character's head before the time runs out. If the character blows out all the candles, hands start to applaud, showing that the player has won.
The person is always Wario, and the table must be tilted left or right, rather than the person's head. It is possible to blow bigger gusts by blowing into the microphone, but this is never required to actually beat the microgame.
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