In the cooperative campaign of Portal 2, ATLAS and P-body are sent to the Hard Light Bridge Factory in the Hard-Light Surfaces Testing Course.Vertical bridges act more as portable walls that can be used as obstacles (for example, to intercept Weighted Storage Cubes). Horizontal bridges can be walked upon, and players can continue seamlessly along them through any portals they pass (given enough headroom). Bridges may be emitted horizontally or vertically depending on the position of its emitter.
