Looking for app games for kids

[Joshua123]

Hi everybody,

I'm looking for app games for kids to kill two birds with one stone where they can have fun but at the same time improve their solving skills or concepts (not necessarily studying them but learning them by looking at how the game works).

I'm asking because I'd like to get my niece more motivated on her studies of science and math subjects and the one she needs the most help with is with math. She's in grade 6 and she's already getting some math help with this app but it doesn't provide much of the "fun game" part I'm looking for, it's more of a traditional way of practicing math. I know for example "angry birds" was inspired by the physics game "Crush the Castle" and it isadhered to physics laws and there are all these videos on YouTube were explained the lessons you can take from angry birds..... well something like that but for math 

Anyways, sorry for the long post, does anyone know of a good game math app? Any suggestions would be greatly appreciated.

Happy Thursday!

-J