Enjoy flash mental arithmetic game!

----------------------Game progress----------------------
- When the game starts, a random integer will appear on the screen based on the game difficulty.
- After the numbers are displayed, a window for entering the sum of the numbers is displayed for 10 seconds.
- If you enter the sum within 10 seconds, you will get the result.
- If the answer is correct, 1 point is earned and the game continues. If the answer is incorrect or time runs out, the game ends.
- Try to get the highest score possible!

----------------------Game Mode----------------------
Practice Mode
- Improve your skills in practice mode!

Ranking System
- Login to Google Play and challenge the ranker!

----------------------Credit----------------------
BGM - Don’t Forget Me by Spheriá | https://soundcloud.com/spheriamusic
Music promoted by https://www.chosic.com/free-music/all/
Creative Commons CC BY-SA 3.0
https://creativecommons.org/licenses/by-sa/3.0/

SE - https://taira-komori.jpn.org/game01.html