In what could arguably be the most expansive update to the game yet, Valve has announced the Mann vs. Machine update. Mann vs. Machine is a new Co-op game mode that allows six players to take on hordes of killer robots in order to stop them from deploying a bomb. The game mode will feature maps specific to the game mode (although only one will be released with the update) and allow players to upgrade their “abilities” and weapons. Surviving all the hordes on all of the missions will yield substantial amounts of loot. Check out the video and update page below!