What is Reddit's opinion of 脳力+ 支払い技術検定 毎日のお買い物をもっと楽しく！?

From 3.5 billion Reddit comments

Play this game:

https://play.google.com/store/apps/details?id=comecomecat.wallet

The object is to use as many coins as possible from your wallet to pay. You'll get much faster at sorting under pressure.

This app changed my life :

(iOS) https://itunes.apple.com/jp/app/id426921880?mt=8

(Android) https://play.google.com/store/apps/details?id=comecomecat.wallet