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Iai is Japanese Old techniques for engaging a sword.The emphasis of training in Iai is on cutting with the sword.Two people fight with Iai,the faster response to vibration win the game. In this game,your iphone become a sword.This is quiet and serious game.However no blood flow.It is quite safe.The app has features to play with "iai" all users. You played game and view your score. please touch the "SWORD" button. Please do not throw away your iPhone.