For any Mario Kart game, beat any cup before a cup with a question mark.
To get mirror cups in Mariokart Wii you willk have to complete all of the cups on all engune sizes
You must get a one star rank or more in the 100cc Retro cups
win in 1st or 2nd in the cup
you get a different title screen
There are 8: the mushroom, flower, star, special, banana, she'll, leaf, and lightning cups.
you have to have gold in all the cups to unlock it :)
50cc 100cc 150cc mirror mode.
Get a star rank or better on all 150 cc cups.
You have to rank 1 star in all 150cc cups
Get one star rank or better on all 150cc cups.
beat the 150 mirror regular cups(the new tracks)
Beat 100cc retro cups with 1 star or better.