In Mirror mode, tracks are reversed (left is right, right is left). It is unlocked by getting gold in all 150cc cups. You run at the same speeds and specifications as a 150cc race. Mirror Mode is somewhat more difficult than Mario Kart Wii 150cc, because all the tracks are backward. This makes it more difficult for the racer to remember where to go, since they memorized the other courses, instead they will forget since it is all backwards. Mirror Mode can make racers more susceptible to having a hard time drifting around courses like usual.
Mirror mode has appeared in most other Mario Kart games.