A welcome app with great learning effect

Looking for inter essaten games with a learning effect for our 9 year old and as an alternative to Wii games I had this app found. I have to say - brilliant! I have long "see fiddle" no longer so interested in our Sohnemann recognize and physilalische relationships and learn. I myself had to think a lot of fun with him, as it then became more difficult, and often was the 9-year-old actually better than I do the adults. He just thinks less complicated. Toll! More of that!