From Introduction:

Cabin Fever

The primary concern in most Outbreak: Undead games is survival, as it should be, and most people can agree that survival falls into the category of fulfilling 3 major needs: Food, Shelter, and Water. But what happens when those base needs are fulfilled, even if only temporarily? Defeating the zombie hordes so that you can continue to upgrade and reinforce your base is all part of the stronghold system in O:U, but what happens when your survivors start feeling the effects of their new life? Just living day to day in a world of the undead can be a great toll on the mind, and without rest, or any form of entertainment to help you relax that mind can take a heavy toll. The ability to handle this stress can end up being the difference between life and death. Morale is important in Outbreak: Undead, and losing it can make a major impact on your stronghold. The following missions can aid you in that battle.