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Depends on what level you are. If your playing single player then the Zombies go up by 5 each round. If your playing multi-player then the zombies mulitply by 10! But it depends on what round you on. the maximum amount of zombies that can be in the map at one time is 24. if one fails to attack the player in a certain amount of time they die to let a new one in

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13y ago

What else can I help you with?