Just Dance Wii 2 (also known as ジャストダンスWii 2) is the second game in the Japanese series following Just Dance Wii. This game is built in the style of Just Dance 3, but lacks some of its features. Like in Just Dance Wii, song lyrics are highlighted light blue when a male is singing and light pink when a female is singing, or if both a male and a female are singing.
Ubisoft didn't change conditions for getting medals, so if your game is hacked, and your game is switched to English language, you can see that some of the medals and thier directions for getting them for them aren't changed.
For example, one of the medals needs Boogie Wonderland to be danced to get it, but the song doesn't appear in the game.
To play this on an American or European Wii, You need a disc called Freeloader. It allows you to play region-locked games on your Wii. It has the ability to detect other languages installed on foreign discs. It is becoming rare so to buy it, go here