Laboratories that work on mysterious experiments sometimes become a source of real troubles. All of those chemical elements and strange substances have a great skill to get spilled somewhere and give birth to blood-thirsty mutants. This is what has happened in Monster Defense. Move to that lab and fix the situation before it is too late. Remember, your hometown is counting on you, so be careful, when the monsters will appear in front of you. Kill them one by one and move further.