Easy to use quite often when I’m otherwise bored and I found I learned a lot of words without any ‘effort’. The only thing that would make this game better is more words as it doesn’t take long to learn them all and other apps that teach other words are not as fun. While I’ve learned more mandarin grammar from structured study on other apps those are also apps that I have to force myself to use whereas this one is fun and easy to dip in and out of. This app is probably my favourite. Wish there was a paid version with more words.