Draw the lines, become the master! They will immediately grow into walls, so you need to know the best place for your art. You will use them to defend people from different nature disasters and enemies. And your construction can help to save the lives of citizens, and they really count on you! It seems to be easy, but if you draw a few lines that collide, there will be the end of all hopes for survival. There are more than 150 levels, and each next is more complicated than the previous one.