Defuse the bomb

  Visualize a situation that you are the in-charge of City's bomb squad division. One day, you got a call that someone has placed bomb inside the school. As you are the in-charge, you need to find the bomb and defuse it, since it is a matter of many kids life. By your brilliance and experience, you have to find and defuse the bomb as soon as possible. This is not going to be easier, as you don't know where the bomb was placed. It is sure that you will succeed by finding the necessary objects and solve the puzzle to succeed in defusing the bomb.