From the Super Mario Wiki
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The player controls a person in WarioWare: Twisted! or Wario in WarioWare Gold that constantly blows air in front of him. The objective of the game is to blow out all the candles by tilting the character's head before the time runs out, whereas in WarioWare Gold, the table must be tilted left or right. If the character blows out all the candles, hands will start to applaud, showing that the player has won.
In WarioWare Gold, it's possible to blow more rapidly by blowing into the microphone, but this is never required to actually beat the microgame.
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