Whistle a Tune

Whistle a Tune is one of the many obtainable souvenirs in WarioWare: Touched!. It is unlocked after the player obtains all gold crowns in all albums. When players blow into the microphone of the Nintendo DS, the game whistles depending on how loud it hears players blowing on the mic.

In-game description

 * "Blow into the microphone to whistle!"