Shake Faster

You shake the phone to trigger the counter. You have 30 seconds. In 30 seconds try to shake it as much as possible to obtain high score. You can challenge your friends and organize a tournament.
There are three difficulty levels: easy, medium, and hard. In easy level you can easily trigger the counter by shaking. On the other hand, when the difficulty is hard you must shake very hard to trigger the counter. You can measure the strength and agility of your arm and compete with your friends.
Hope you enjoy the game. All feedback is welcome.