[iMathDrills 1.1 PreRelease]

The App Store "iMathDrills" to register 1.1 and is pending review.
Change "difficulty" from "digit".
Fine-tuning the degree of difficulty.(=Difficulty2)
Add a high degree of difficulty.(=Difficulty4)

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App Storeに「iMathDrills」1.1を登録して、審査待ち中です。
桁数を難易度に変更し、難易度1(簡単)～4(難しい)まで追加、
難易度の微調整とより難しい難易度を追加