To become a great warrior of the ancient Japanese art of the ninja needs for many years the most brutal training during which you can die. Here is one such training, namely, checking the reaction. Your goal - to catch an arrow released to you immediately after the shot - you need as quickly as possible to click the mouse button. If all goes well, then you will be detailed statistics and will assess your response, but if you do not have time, then the outcome is obvious. Mouse control. Good luck!