From the Super Mario Wiki
Mario & Sonic at the Olympic Winter Games
Halfpipe appears as an event in the Wii version of Mario & Sonic at the Olympic Winter Games. In the Nintendo DS version, there is a Dream Event called Deluxe Halfpipe. The player will go up and down the halfpipe doing tricks to earn points. Some of the tricks are backflip, double backflip and front flip. Tricks are done by shaking the Wii Remote.
Mario Kart Wii
Halfpipes are ramps at the sides of some courses that the player can trick off to get a boost of speed. They are blue with white arrows on them.
The halfpipes appear in the following courses:
Halfpipes also appear in the following battle courses: