Super Sonic Downhill
From the Super Mario Wiki
Super Sonic Downhill is a Dream Event in the DS version of Mario & Sonic at the Olympic Winter Games. This event is, unlike most other events, complete 2D and takes place on Trial Mountain. The player must ski down to the bottom while avoiding obstacles on their path. Barriers protect the player from obstacles whilst Mushrooms increase speed. If the player gets hit by obstacles a total of three times, they will retire and lose the event. The player with the best time at the end of the event is the winner. Dry Bowser is later fought here.