Nintendo has begun what will be a continual stream of Mario Kart Wii online tournaments.
The inaugural competition started yesterday and ends "5/9" according to the official site, which probably means 9th May.
Simply achieve the fastest time on the Mario Circuit to win; you can retry the course as many times as you like.
Every few weeks a fresh tournament will begin, with some based on times and others revolving around certain challenges such as collecting coins or using specific characters. Tournament races will also often exhibit unique rules or feature obstacles not usually there.
Sounds like lots of fun oh yes it does.
Mario Kart Wii was released in early April to wide applause because it has motorbikes in. Pop over to our Mario Kart Wii review to find out more.