Editing Team Fortress 2 (section)

===Mann vs. Machine===

The only proper "Cooperative" mode, in which a team of six players is pitted against several waves of AI-controlled robots. The bots want to try and bring a bomb across the map to the Control Point you're defending; defeating them makes them drop cash, which can then be used to upgrade your abilities and weapons. You also have to fight powerful "Boss" robots with unique gimmicks at the end of each level as well as facing mid-wave minibosses like Tanks (durable but slow bombs on tracks,) meaning that team cohesion and good loadouts are crucial to this mode.

This mode also has a rather different meta to the main game due to the upgrades system and enemies, with otherwise mediocre weapons becoming robot-mulching superweapons and the potential for every class to play its part. (That said, Wrangler-Frontier Justice Engineers and Mad Milk/Fan-o-War/Force-A-Nature Scouts are pretty much auto-includes for MvM competitive courtesy of their sheer utility to the team in taking out/slowing down bomb carriers.) Completing Tours of Duty by spending RL money on one-use tickets also ensure you get a random Strange-quality "Botkiller" stock weapon, with a very small chance for the coveted Australium weapons to drop from the highest-difficulty campaigns.

Unfortunately, like any game of TF2, there are [[That Guy|tryhards]] that will ruin your day if you even slightly deviate from meta. Though those tryhards have a point with their aversion to people using the Gas Passer, given how braindead OP it is in this mode.