List of coupon codes for free rubies!
Below you can find a list of coupon codes which grant 1600 free rubies in total:
In order to active them you need to go to the options ingame. Go to the "Other" tab and click "enter coupon".
A link in the browser opens where you need to enter your player tag. You can find it in the first ingame options tab.
After that just enter the coupon codes and active them one after another.