Release the game 700 days to live, you have to survive 700 days without dying. Then you are rescued from the island ( just to find out you were actually in a simulation ,hense the no sleeping) all this was a training exersize to get you ready to deploy in the real thing. After day 701 the "Real" game would begin...No adjustability on levels, no diffiuculy levels, game stage transfers to # of infected in random hoardes and blood moon hoardes..