The famous thief named Lock Master wants to get into the guarded building and steal expensive jewelry. You will need to help your hero break locks. Before you on the screen you will see the playing field on which the castle is located. Inside it, a ball of a certain color will be visible. A special arrow will run in a circle. You will need to combine it with the ball. To do this, guess the moment when it will be in the place you need and click on the screen with the mouse. This way you stop the arrow and open the lock.