This app is a new type of training app that can be used for a short time or to kill time.

Calculations that require concentration, mental arithmetic, etc. are set, and there are various types of answer formats such as "○ ×", "one question one answer", "sort", and "four choices", so you can enjoy it without getting bored.

Also, depending on the difficulty of the question, it is categorized from beginner to advanced, and you can choose from it, so you can enjoy either light training or solid training.

There is also a ranking, and you can rank up by earning points. Let's aim for the top ranking "S class".
It's completely free so download now!

*BGM/sound effects
devil soul