Noobies Invasion

A squad of alien creatures trying to get to your base. Fighting with them is possible only by logic, namely, to keep them out further than is required. These balls will roll through the maze that can be changed during the game. Note the yellow field, that they then can be changed. As soon as the ball will roll under to this site, click on the area and make fools in the design, thereby to stop the ball. When there will be a few, there will have to think about how to stop the first, if at least one break through to the exit, you will lose.