To unlock the 3rd cup of the 4 on the same line, you must complete the first 2 cups. If I remember correctly, in Mario Kart Wii, you don't necessarily have to get Gold, you can get a Silver or Bronze cup. To get the last cup, on that line, you need to complete the 3rd cup.
That is, complete Mushroom and Flower on Mario GP on any class to unlock the Star cup, and then complete Star Cup to unlock Special Cup. Do the same thing with the bottom 4, Shell and Banana for Leaf, then Leaf for Lightning.
you have to beat all the cups in 3rd, 2nd, or 1st place
To unlock the other cups in Mario Kart for the Wii, you must play the other cups, and in addition, you must win.
you have to have gold in all the cups to unlock it :)
Get one star rank or better on all 150cc cups.
you have to do time trial races to unlock characters/vehicles
star rank on all 150cc grand prix cups
to unlock dry bowser, you need to get a one star rank or better in all 150cc Wii cups (all the cups on the top)
To unlock dry bowser, you nedd to beat the first 4 cups on 150cc with one star or better.
Beat 100cc retro cups with 1 star or better.
You must get a one star rank or more in the 100cc Retro cups
You have to complete 100cc Retro cups. You also must have at least 1 star!
Sadly, you cannot unlock him on the ds. he is unlockable on mariokart wii fortunately.
it is shyguy you can unlock him when you play mariokart DS download play
To get mirror cups in Mariokart Wii you willk have to complete all of the cups on all engune sizes