This is japanese right brain training called Flash Anzan.You add all numbers popping up one after another.This mental arithmetic application will make you able to perform hundreds calculations a minute.If you fall into a slump, you should remember following words.Don't think. FEEL!(Bruce Lee)Main function:Speed range (2.0秒-0.15秒)Digit number (1桁-5桁)Number of calc (5回-300回)Including negative number or notFixed number of digits or notTo save the percentage of questions answered correctlyTo retry t
he previous questionTo start again where you left off
... moreless ...