Whistling

Whistling is an action you can do in Wuppo and Wuppo: Breft Festival Forever through right-clicking (KB+M) or pressing the B button (controller). Whistling is used to multiple things in wuppo such as breaking free of bubbles in the Tussen Dimension.

Whistling Uses
Blow bubbles with the blowpipe on Pedros island.

Extract bluswater from the air for the blusser bucket and ultra bucket.

Break free of bubbles in the Tussen Dimension.

Whistling Upgrade
Whistling can be upgraded to extract bluswater from the air by talking to the Blusser on the furthest Blusser Island.