Sry But I can't stop stop feeling that to create the pinkish monster they took a picture of an ass and put eyes and rat teeth on it... xD The cheeks even vibrate.
It's pretty easy just click right in the middle, that way they can spread in all directions at the same time. I might take a few tries, but I did lvl 12 in 3 tries like this.
 "Monster Arena"){kind=icon}
 "Particles"){kind=icon}
 "Boomshine"){kind=icon}