After the regular tests, the professor has released all of his monsters at will, but did not know that some of them will be aggressive. On the screen you will see a few characters, some of them will need to be put back in the cage. To do this, look closely at what kind of monster must be eliminated. Most are dressed and look similar, but there are small differences, study of monsters, is given to the study of a few seconds, and when you believe that you have found someone who is in the image click on it with the mouse to remove.