A multi level cube made of clear one way sheilds which can be destroyed to make those above fall or provide escape for you . Man cannons boost between levels with power weapons on the top level which is also where the infected start the round . Being one way sheilds once out side the cube you can boost or ground and pound your way back in or too destroy the floor and drop you a level . Being able to see through all walls and floors gives advantage to staying up top though up top is harder to escape from .