暗算王決定戦

I will decide Japan's best mental arithmetic FLASH!
With this application
"Number of problems" "Number of digits" "Display speed"
You can challenge FLASH mental arithmetic by myself.

The score varies depending on the setting condition
The ranking is decided by that score.
Let's challenge your limits by all means!

You can also challenge FLASH mental arithmetic with setting of ranking superiors.
Let's experience the terrible nature of Japan!