Yes, 高级英语语法练习 English Learning Game is completely free and it doesn't have any in-app purchases or subscriptions.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
高级英语语法练习 English Learning Game is free.
To get estimated revenue of 高级英语语法练习 English Learning Game app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.