Brain training calculator

By Hideaki Uchikoshi on AppTrack Ninja.

Every time the user presses a number key, all number keys disappear and their arrangement changes. Entering numbers can be hectic and requires concentration and patience. Users can exercise their brains and keep themselves busy. <モードオン・オフ> 隠すモードボタンを押す。 ※普通の電卓に戻る場合は、ボタンを再度押す。

Categories: Utilities, Productivity

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