We Ski And Snowboard
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At Mt. Angrio (Ride the Mountain), enter the purple circles next to one of the helicopter launch spots (at the signs marked "1" through "6"). Press A to use the helicopter, then immediately hold B + Up to replace it with a UFO, which will take you to the other parts of the mountain.
Swing the Wiimote at the map screen to throw snowballs at the screen. Note: This can also be done at some other screens.