You can go with the easy mode to practice before trying your chance in the hard more. The difference between the two modes is that in the easy mode, you can see the approximate spot the ball will hit, while in hard mode, you must watch the ball to guess. Also, you double your credits in the hard mode. Move the gloves to the right position to catch the ball, and click. You can use your credits to unlock new glove styles and continue your career with customized skin!