Surface Ex-Tension is my third map for SvenCoop after the scrapped BodyGuards, and was originally intended as just something to mess around in, but as expanded into a full blown Co-op adventure featuring large set pieces and puzzles all over the shop, with some pretty sweet architexture to boot.

Surface Ex-Tension has the players fighting grunts and aliens in a bid to navigate the topside areas of Black Mesa and reach the tram system to the Llambda complex at the opposite end of the base. Just like the level(s) it gets its name from.