They have LEGO Harry Potter for iPad/iPhone? How's the gameplay? What is it like?
Have you played any of the Lego games? Basically it's the same set up - you have different levels like the Dursley house, Diagon Alley, and obviously Hogwarts but there's also Hogsmeade, the Chamber of Secrets, and the maze from the 4th book/movie, etc - there's lots of places!
Your main objectives will be given to you by various characters in the game - do this spell, find this or that, or gather these items, etc. You also collect studs - little Lego circle things, same idea as collecting coins in Mario or hoops in Sonic, wizard hats, chocolate frog cards, little red Lego squares, all of which unlock various things in the game for you - more characters you can play as, little 3D models of scenes (which doesn't really add anything to the gameplay itself, it's just something fun for you to look at? idk haha) and some other stuff...
The gameplay itself is pretty fun, it took me a while to get used to the control schemes. You have the option of using a d-pad though (can be turned off), which is nice. I liked playing with the d-pad better but that's just me. The spells are easy and intuitive to do - just trace the shape on the screen. The game wasn't overly difficult for me, but there were a couple of frustrating moments - thankfully, nothing that made me want to walk away from the game. Just enough challenge to keep things interesting.
Fun fact - I just checked, and I am at 55% completion, and that's after nearly 12 hours of play. Crazy! There is tons to do even after you beat the main story. I'm impressed, especially considering it's an iPad/iPhone game.