脳トレ-フラッシュ暗算アプリ-Flash Anzan- is a free Android application developed by villager that offers a unique and challenging way to train your brain through flash mental calculations. The app allows you to enjoy flash mental calculations and challenge yourself to reach the top of a 100-level dungeon.

The app's main feature is the flash mental calculation game, which aims to improve your mental arithmetic skills. The game consists of solving math problems quickly, using only your mind, and without the use of a calculator. The problems are presented in flash format, which makes the game more challenging and exciting.

The game's objective is to reach the top of the 100-level dungeon by solving math problems. As you progress, the game becomes more challenging, and the problems become more difficult. The app also includes a ranking system, which allows you to compete with other players and see your ranking in real-time.