Such examples include boarded up doors/ladders and restrictive barriers cutting the area off from the rest of the map. In almost every Survival map, several areas are cut off to prevent reaching the saferoom or overpowered holdout spots. There are currently forty-one different maps to play on in Survival Mode, thirty lifted almost directly from the campaign mode, along with a formerly Left 4 Dead 1-exclusive map called The Lighthouse that is attributed to a campaign called The Last Stand, which was released as part of the pack. There is no way to win, as instead the goal is to survive as long as you can and set new records. This game mode throws waves and waves of the Infected at the Survivors until they get fully overwhelmed via every survivor dying or or getting incapacitated.
Survival Mode is a game mode initially released as Downloadable Content from Valve Corporation the Survival Pack.
