When adding a Zombie to the Courtyard, do not place a Zombie on the Courtyard, but instead reduce the Barricade Token by 1 space on its track. If the Barricade Token ever reaches “0,” then remove 1 of the Survivor Tokens in the Courtyard from the game, and then reset the Barricade to “2.” If there are no Survivors left when the Barricade reaches “0,” then the Humans lose.