Just recently LEGO WB games released an app for the iOS called LEGO Harry Potter Years 1-4.
I got this app and I have to say its worth the money.
It has some very easy-to-learn control's and the graphics are pretty good.
The games has many many levels most challenging and fun.
I have to say WB games outdid their selves and this really fun and addicting app!
It also has some really nice character detail.
and throughout the game is just like the first 4 movies (Of course with some twists and turns)
All in all I give it a 4 and a half stars out of 5 stars.