I won n Super Mario Kart DD against some people who works for Nintendo of Italy.
I reached in 2 days about 7650 points in Mario kart Wii Wifi (you start with 500 and the maximum you can reach if you arrive at the 1st place is around 114 and the minimum is 36- it depends from how many people is playing against you during the wifi ride), but then the connection doesn't work sometimes...and if the wifi disconnects during a ride, you practically loose about 100 points every time. More then when you loose...T.T Stupid router....