Mann vs Machine

Mann vs Machine is a gamemode in Team Fortress 2. Released on August 15, 2012, the gamemode consists of six players fighting against a horde mode survival mechanic. These players (shown as the RED team) must endure waves of AI controlled robots that feature equal or similar traits to the original classes. The gamemode introduces an Upgrade Station that can give bonuses to the players during combat by using the money dropped from the robot masses, different sets of passive/special upgrades per class, and a tracking system of "Best Moments" separate from the original PvP mode.

So far, the gamemode has 6 different maps and 29 different missions set to either Normal, Intermediate, Advanced, Expert, or Nightmare difficulty.