Currently rendered unusable in iOS 9.
This is an excellent product and certainly is great for schools and parents wanting to teach their children chinese characters. Its strength lies in the fact that it can have customised lists which can be configured to whatever students are learning in class. Unfortunately there is currently a problem with the writing of the characters in the game and practise mode which makes this practically unusable. Otherwise I would be giving this a 5* Rating... In fact if it gets fixed I will come and write another review to that effect!