Seconded. HelloChinese is so much better at teaching than Duolingo and it scratches the same game-like itch.

this is the best app I've found https://www.superchinese.com/

Duolingo is good for "tourist style" language learning, where you learn some phrases, can recognise and read a few words, etc, but next to no chance of actually pulling off a proper conversation with a local.