孵蛋及闖關進度無法作用
完成book6第一單元學習內容後,孵蛋功能無作用。完成第二單元內容後,成績為空白。
Yes, R21 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.
R21 is free.
To get estimated revenue of R21 app and other AppStore insights you can sign up to AppTail Mobile Analytics Platform.
完成book6第一單元學習內容後,孵蛋功能無作用。完成第二單元內容後,成績為空白。