Team Fortress 2 features a simple, yet highly enjoyable multiplayer shooter experience. And hats. Lots of hats.
There are several different multiplayer modes available, as well as a co-operative “horde” style “Mann vs Machine” mode.
The game has been around for a long time, but has received regular updates and new content, and recently went free-to-play. In some ways it’s Valve’s own testing ground, with new Steam features such as Trading Cards debuting in Team Fortress 2.
Mods are available via the Steam Workshop.