Left 4 Dead 2 is a great game of survival and zombies and chugging pills. It’s also open for modding, and so the fan community has created a number of maps and missions for players to enjoy. One of those is Cold Stream, an extension of the campaign set in a forest along a river. PC gamers can download Cold Stream for free, of course. Gamers on the Xbox? Well, they have to pay. Why should Xbox players have to pay for free content? GamesRadar has the story.