www.youtube.com Click here to watch the previous episode of Proving Ground! Proving Ground - Portal 2 Co-op Winners, Mortal Kombat Update, Escalation George Romero Challenge Welcome to Proving Ground, Respawn’s weekly gaming challenge show. This week, we unveil the winners of our Portal 2 chamber 4, level 8 speed run challenge, drop an update on our Mortal Kombat ladder challenge, and see if our viewers have what it takes to take down George Romero. Want to take down Steve and Larson? Too bad! But you can try by liking us on Facebook at www.facebook.com or following us on Twitter at www.twitter.com In this video you will see: 1) How to breeze through Portal 2's chamber 4, level 8 in under a minute 2) How to not compete in a challenge 3) How to worship at the feet of George Romero - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Follow Machinima on Twitter! Machinima twitter.com Inside Gaming twitter.com Machinima Respawn twitter.com Machinima Entertainment, Technology, Culture twitter.com FOR MORE MACHINIMA, GO TO: www.youtube.com FOR MORE GAMEPLAY, GO TO: www.youtube.com FOR MORE SPORTS GAMEPLAY, GO TO: www.youtube.com FOR MORE MMO & RPG GAMEPLAY, GO TO: www.youtube.com FOR MORE TRAILERS, GO TO: www.youtube.com TAGS: "Proving Ground" PG Steve Larson Machinima Respawn gameplay challenge speed run "Portal 2" "Aperture Laboratories" "Mortal Kombat" "Call of Duty" "Black Ops" "Call of the Dead" "Mr. Sark" Valve "Sub Zero" "chamber 4" co-op update <b>...</b>