I previously rate this game 3, but lower it to 1 now because I found out that the amount of coin that you can get in 1 battle is capped on 200. I used gold mine and make it until I get more than 200 coins during the battle, and now the double coin event is still ongoing. So I should have gotten 400 coins at minimum. Alas, it is capped so I only get 200 coins no matter how. Seems like this game forced us to buy coins. Non-paying player say good bye.