周辺視野トレーニング EXTRA is a free Android app developed by Blue Rock that provides a challenging way to improve your peripheral vision. The app has recently increased the difficulty level, making it even more challenging to clear the first level. The app requires you to tap randomly generated numbers from 10 to 99 in ascending order to improve your peripheral vision and quick decision-making skills.

周辺視野トレーニング EXTRA has two modes to help you improve your peripheral vision:

• Score Attack mode: In this mode, you have to tap the numbers in ascending order within a limited time. You lose one point for every mistake, and you get bonus time added to the clock after clearing each level.
• Time Attack mode: In this mode, the app measures the time you take to clear the first level.

周辺視野トレーニング EXTRA is not only an excellent app to improve your peripheral vision but also a great way to enhance your quick decision-making skills. The app is available for free on the Google Play Store.