App that helps to educate my kids

I've two sons, Ruud and Dylan and they like to play on my iPad. I don't want them to get exposed to violent and aggressive games, so I downloaded an educational app a few weeks ago.
It's called Dikkie Durf (dutch) or in English 'Dave Daring'. Dylan is 4 years old and likes to play the game.
His vocabulary is increasing significantly and he gets more skillful with the game every time.
The app can be played in more languages, so I'm now trying to learn Ruud a few Englisch and German words, like butterfly and bird.
I have downloaded the game in the iTunes store: [Only registered and activated users can see links. Click Here To Register...]. Also downloadable in Google Play: [Only registered and activated users can see links. Click Here To Register...]
I think that educating a child with games can bear fruit for his future. So I'm ignoring the books and let my child play on his own. (I also were tired of reading books for him)
I hope that more educational apps will be developed in the future.

Greetings TH-AC-BR

I hope so too :)