How many free towers, walls and gates do you get?
You get three free towers and one free gate per castle, with the third tower for each castle coming as the prize for 22,000 gold. Extra towers, walls, and gates for the first castle can be bought with elixir. Extra towers, walls, and gates for Boxingham and Recycle Castles cost donuts, although I've read on here that you can get walls for free once the castles are upgraded to Level 20.
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