A post on the Left 4 Dead blog shares details of the Survival Pack downloadable content due out next week. It will be free, and available for both the PC and Xbox 360 versions of the game. "Our goals for Survival Mode are to deliver a mode of play distinct from Campaign or Versus, have games that regularly last under ten minutes, and emphasize competition with team play through leaderboards. Survival Mode draws on the planning and communication aspects of a successful Finale or Crescendo event, while taking it to another level. It rapidly hits a fever pitch that only a well coordinated team will be able to successfully survive. ... Given the extreme pace of Survival Mode, the number of zombies killed in a single round often outnumbers an entire campaign."