Keisan-Hakusho

A calculation power training app that solves many mental calculations within a time limit. Activate your brain by improving your judgment, concentration, and mental arithmetic skills! How to play [Normal mode] Aim for your personal best by solving as many questions as possible within the 30 second time limit! You can select the calculation method from [Addition/Subtraction/Multiplication/Division]. You can select the difficulty level from [Easy/Normal/Slightly Difficult/Difficult]. [National exam mode] Solve many problems within 60 seconds and compete with players from all over the world!