It is the "Doodle Monster" who fought DoodlePants at Bikini Bottom. The battle takes place at the top of the tower. If DoodlePants falls off the tower, it will end up losing one unit from its life bar. There are also a few platforms, and at the start of the battle, he rises from the green goo.
Its strategy is to perform a punch. To damage it, hit it in the head a few times until it is stunned then erase it. There are two ways to reach its head: One is to ride the platform and jump far and the other is to bounce on its arm. When it goes out of its stunned state, it will laugh and hit the ground. If its health is low, the hit will produce a shockwave. At the end of the battle, he will sink into the goo exploding, erasing the previously unerasable goo.