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 (4.0sec - 0.15sec) Number of Digits (1 - 5) Number of calculation times (5 - 100) Including negative number or not Fix number of digits or not To save the percentage of