I agree with what said above I tunes rankings aren't necessarily...

I agree with what said above I tunes rankings aren't necessarily required if they get high ranked it may just be a bonus

I also noticed kneoworld apps are mostly just for I pad so hard to get in top 50 for an educational app solely for I pad? Probably why you can't see them in the App Store on your I phone.

I can't see why I tunes would help promote an app that is free and takes subscriptions so I tunes can't get a cut