A circular track located in a lobby, hence the name, with a highly-polished floor. There is one path for the bloons to appear. They loop once every circles in the track, from biggest to smallest. The direction of odd circles is going to the left, and the even circle is going to the right. After they had looped all the circle, they go back to the starting point of the track as they exit. There is water at the top-right and bottom-left of the second circle from the centre.