We brought this game for my 7 year old hsm mad daughter for christmas after spending weeks trying to get hold of a copy.
ON the hole the game is very good the graphics are excellent.

you have different games to play, the first is called story, this is a competition where they have different levels to compete in as you play on the top of your ds screen you have the people ie troy ready to start to dance to your comand and on the bottom screen it comes up with little objects, you have to hit them as they turn green if you do this you will move up a board but if you miss one you move back down. you earn the preformers new clothes if you get a B or higher and you move on threw the levels but you dont need a B to move thou as any grade alows you to do this.
The next game is called quick play this is more or less the same as the first but you dont get graded on it and you will need to play the story section to games.

The next is videostudio this is good my dayghter loves this one as you get to edit and replay the videos you did in the other two games
The next is multiplayer we havent played on this as you need someone else with the game and a ds.

I would highly recommend this game but not for the 3+ that it is rated as my daughter and i struglled to do some ot the levels.
the game cost me £29,99 brand new but i've heard of other people that they paid less