N-Back Training

I wanted to play "Oni Keisan" on my iPhone!

That's why I created this N-Back brain training app.

What is this training?

Solve calculations while remembering the answers from a few questions back.

Juggling "memorizing" and "calculating" at the same time gives your brain a real

workout.

Features

◆ Two Input Modes

- Tap Mode: Quickly tap the answer

- Handwriting Mode: Write numbers directly

◆ Build Daily Habits

- Set daily play goals

- Track your streak

- Record how you're feeling today

◆ Track Your Progress

- Accuracy trends

- Level-up history

- Play history

◆ Customize Your Way

- Adjust question count & time limits

- 3 color themes

- iPhone & iPad support

Perfect For

- Those who want to play Oni Keisan without a dedicated game console

- Anyone looking for a quick mental exercise

- People who want to build a daily habit

Just 5 minutes a day. A casual brain training experience.