價格：免費
更新日期：2016-04-25
檔案大小：5.2M
目前版本：1.0
版本需求：Android 4.1 以上版本
官方網站：http://www.sebastianjas.com
Email：jassebastiandev@gmail.com
This app includes several different derivative problems.
Each game includes your score and gives you exactly 2 minutes per exercice.
You can practice anytime and everywhere you want.