I discovered Komodo by a friend's indication. The App experience started great by doing an assesment on my children's math's knowledge and proposing a journey throught maths! Both of my kids loved the App and what a surprise when we received the stickers of the belts in our home! It's really great to see the way that math's concepts comes up in the journey. This week my son achieved the Black Belt level! He was so happy with his achivement and everybody celebrated! The only down side is that the app is only available in english (not our mother language) and because of it in some level's (spoken numbers, problems, ...) become impossible to him. I sure recommend it, and hope someday it get translated to other languages (Brazilian Portuguese in our case)