Valve has released a big update to Team Fortress 2's 'Mann vs. Machine' game mode this week, which of course pits human players against an army of invading robots. The update adds two new difficulty settings called tours, one tougher and one easier than the current mode, along with some new loot found throughout the two tours.

Players will also be able to search for multiple missions or tours at a time. Matchmaking updates should make it easier to find and keep groups while playing: once you find a team and defeat a mission, teams will stay together. Good thing, too - those robot hordes aren't going to destroy themselves.