Yes there is an instant win cheat for Mario Kart wii (online). Ive seen 3 people use it in the past. Ive never been able to find it on the internet though, but it does exist!
There is a lot of cheats at WWW.IGN.COM & WWW.GAMESPOT.COM you go to wfi and win all the time. you go to MCdonlds and ask for a Mario kart special.
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If you need to unlock her in Mario kart wii here is the answer: Win the 150cc Special Cup. If you need to unlock her in Mario Kart 7 here is the answer: Win the 150cc Mushroom Cup. Source: I beat Mario Kart Wii, and I unlock Daisy in Mario Kart 7.
In Mario kart wii you have to win the 150cc special cup
By doing it
No
Win 100cc Lightning Cup.
You can't... but you can play as Mario himself who's in a Mario Suit!
win grand prix's
In order to unlock this kart, you must win the 50CC Leaf Cup.
Win a grand prix
win 100cc special cup