Mann vs. Machine is a co-op mode in Team Fortress 2 that is comprised of gameplay in which 6 players team up to stop AI robots from deploying a bomb. Though not the central gameplay of Team Fortress 2, it is a mode that allows for co-op play to be enjoyed with the characters of the game. Mann vs...
When playing this game on a high resolution screen the game will look small and dense, which may be irritating that it does not scale to ones resolution as it can be difficult to read the text or see what is going on.
Old versions can't play online or LAN with newer versions of the game. So for those that prefer using an older version, or just have not updated, they will have to make sure those they want to play with online have the exact same version (or one that is compatible).
This game often requires engineers to build things, medics and covert ops to protect them, and soldiers to do the dirty work. Yet the mechanics are not so stringent as to make it near impossible to play with only two or three. Essentially, this game requires just the right amount of cooperation.