Yes, 数字游戏 - 心算解题 is free to download, however it contains in-app purchases or subscription offerings.
Not enough reviews to make a reliable assessment. The app needs more user feedback.
数字游戏 - 心算解题 has several in-app purchases/subscriptions, the average in-app price is ¥44.80.
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4.3 out of 5
37 ratings in China