Good ol' Valve. Purchasing Turtle Head, err sorry Rock Studios and helping to bring us such a great game that is Left 4 Dead. If you haven't played Valve's 4 player based cooperative Zombie FPS you are missing out! For those that have and are interested in checking out how everyone is doing as a whole, stumble over this link to have a gander at the statistics of how people are doing on the achievements. It seems to be that Drag & Drop (which is rescuing a survivor from a Smoker's tongue before they take any damage.) with 72% of people having accomplished that. If you're keen to get your game on, please don't hesitate to check out my gaming community, Gentleman-Bastards - we've got 4 public Left 4 Dead servers and a few others with more coming soon, so, please stop by and have a shout on our forums if you want. Enjoy!