I have spoken to the Chinese team and asked that they provide me with a list of apps that they use with our children that could also be used at home to help our children develop their Chinese. Here is the list. The apps can be found by searching in your HK apps store. Most are free.
Beginner:
Love Chinese
Couting 101
Numbers
KidsMandarin
Intermediate
WordTracer-CN
EsonPutonghuaHD
Learn Chinese
Pinyin
Advanced:
StoryPatch