Left 4 Dead 2 is one of those quintessential PC games, the kind that everyone touches at least a little bit. This is one of those Valve games that's actually very basic in design and doesn't have a lot of content to offer, but what is there are the fundamentals polished to perfection, creating a game that never leaves you. Between the workshop content and the number of people always willing to play it, there's a chance you'll never uninstall it. It's one of the go-to games for my friends and I when we're looking for something to play together for a reason.