you will be a sprinter. The 400 meter dash competition is carried out on a sunny day. The sky is blue and white clouds flutter in the sky. There are a lot of audiences on the stand. They refuel and cheer for you. You may hear their yawp. To attend this competition, there are 4 roles you can choose from, number1, number 2, number3 and number 4. They have different strength, energy, endurance and power. All of these were pressed by stars. You can choose one which you like. In the competition, you can run by pressing the Left and the Right arrow keys alternately. If the frequency of your pressing of the two keys is different, the speed of the sprinter is changed. You should strive for the maximum speed. Wish you good score!