Almost all of us in everyday life use various locks. Sometimes they fail and break down. Then we call special masters to open them. You in the game Lock Challenge will work as such a master. Before you on the screen will be visible closed lock. Inside the mechanism will be a special circle. Upon a signal, an arrow will appear inside the castle and will run in a circle at a certain speed. You will have to guess the moment when it coincides with the circle and click on the screen with the mouse. This way you lock the arrow and open the lock.
