The number of Witches depends on the server preferences, the game difficulty and the "mood" of the Director. In Left 4 Dead and Left 4 Dead 2, the Witch is usually seen at least once in most levels. In a few rare cases, two Witches may be present on the level, and sometimes in fairly close proximity to each other. If a Witch does not appear on a level where she may spawn, the chances of one appearing increase in subsequent chapters.