Dream Snowboard Cross
From the Super Mario Wiki
Dream Snowboard Cross is an event in Mario & Sonic at the Olympic Winter Games. Players need to reach day 16 after defeating Eggman Nega or day 12 after defeating Jet to try this event. Unlike regular snowboard events, this features items. This event takes place at night at Radical Highway, which is a stage from the Sonic Adventure 2. Some parts of the stage are very similar to the original, while others were completely removed altogether to make it suitable for snowboarding. It is also impossible to fall off the course, even when grinding on the sides of the cable suspension bridge (with the exception of failing to go on the boost jump, which will result in either falling or flying through the air faster than normal, thus saving time). The player can also collect rings, and when getting enough, pressing the button will give the player a boost, just like in Dream Alpine, Dream Ski Cross and Dream Short Track.
Dream Snowboard Cross also appears in the DS version, referred to as Extreme Snowboarding. In the version, the player must snowboard two laps round a track. Its obstacles are a Chain Chomp and some Egg Pawns. When jumping off ramps, the control pad is used to perform tricks to fill up a bar on the bottom right of the top screen. Tricks cannot be performed unless is pressed at the edge of the jump. Pressing twice quickly uses the character's special dash and depletes the bar. A ghost can be used to steal some of the special dash time from other players in front. Bowser and Dr. Eggman are battled here.
Mario & Sonic at the Sochi 2014 Olympic Winter Games
Dream Snowboard Cross also appears in Mario & Sonic at the Sochi 2014 Olympic Winter Games under the name Groove Pipe Snowboard. This time around it takes place in Mushroom Bridge from Mario Kart: Double Dash!!. The event has minor changes from the previous version. The first is that coins will not give the player a special boost, instead gradually increasing speed. A second difference is there are 2 laps in this version rather than being one long pathway to the finish. Players can create trails on groove sections of the track to use later for speed boosts.