Valve Can Count to Three

I've played a few of Valve's games including, the Left 4 Dead series and Portal 2. Although I haven't played any of the Half-Life games, I know that they are among the more famous games of the series. For those of you who don't know, the game primarily centers around Gordon Freeman who you play as in a first person point of view in a world where an alien-virus-thingy has infected most everyone. Something like that. Like I said. I haven't played it, but I do plan on playing it when I can. Now, as you might already know, a Half-Life 3 has been confirmed, no joke. There isn't a release date yet or any other details except that the program that Valve is using is designed to keep anyone who isn't currently working on the game from seeing any aspect of it. Also there have been rumors of a Left 4 Dead 3 and possibly another Portal game, not necessarily a Portal 3, though. These rumors sparked when an email containing folders labeled with these names were leaked.  It was later confirmed by a developer from Valve that the email was real and that they are discussing making these games. I guess we will have to wait and see. Post in the comments below what your favorite Valve game is and have a great day!