脳力+ 支払い技術検定 毎日のお買い物をもっと楽しく！

This app will test your "payment technique", the technique of paying without increasing the amount of change in your wallet.
If you always pay with bills because the calculations are troublesome, why not take this opportunity to practice how to pay smartly?

Clerk: "Your bill is 867 yen."
You: "1422 yen, please."
Clerk"……?"
Clerk ``!! ... in return for 555 yen.''
You "(smiling)"

Once you experience this, you are already addicted.
Start improving your payment skills today!