Blueprints are looted from zombies as random drops and from completely clearing rubble. Construction zombies drops blueprints more often than other zombies.

5 blueprints are also given as possible reward from presents dropped by elf and santa zombies.

They are used to upgrade buildings to unlock the second crafting option for the building being upgraded.

Blueprints can also be achieved as free gift from neighbors or acquired using the wishlist.

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