Zombie boss game pack download

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No information on what platform you're on.
No information on what question you have in regards to the pack.

Yes there is a pack called that, it's the Zomboss Down DLC.

It is free.

To see if it automatically or has already been installed, check your stickerbook to see if you see any stickers beginning with "ZD###".

You would also be able to play on the new Golf Course map in Gardens & Graveyards or have access to the Gnome Bomb playlist if it's installed.