There are several ways in which you can get extra gold for free. There are daily goals (for example, kill 25 zombies), achievements and, on mobile versions of the game, you can watch video ads or complete tasks from offer walls to get extra gold.
There are several ways in which you can get extra gold for free. There are daily goals (for example, kill 25 zombies), achievements and, on mobile versions of the game, you can watch video ads or complete tasks from offer walls to get extra gold.