Ive completed 25 of the lessons on this app and its been fun. The game introduces you to a lot of vocabulary, however, it only tests your Chinese to English skills. It never makes you to translate English words to Chinese. Theres also not a good system to gauge how well you know the words. By just grinding through a few rounds of the games youll have "mastered" a set of vocabulary according to the app. Unfortunately if youre like me youll forget lots of it. It also really only covers vocabulary -- very little grammar. I would say overall this is useful for getting a decent vocabulary base but youll have to supplement it with something more elaborate.
Seraph_Xer0 about Learn Chinese (Mandarin) by MindSnacks