The game itself was pretty good, but what really made it a gem of the arcade was the physical experience of it. You had to look through a tank-style periscope, inside a dark cowl formed by the game's cabinet. Once you took the controls and pressed your face into the viewfinder, you were transported into another world. The game also had deep, rumbling bass that you'd feel in your chest, ratcheting up the sense of urgency and danger. It was a masterpiece of emotional scenery; most VR games I play today don't achieve what Battlezone did in that regard.