What are coupons?

Coupons are a dynamic mobile form of Premium Time.
You can purchase coupons, or get one for 2 days when your account reach level 15 and 30.
The advantage of coupons are that you can activate it when you see fit, or you can give it to other players.
A new feature has been added to coupons, it can now be used to double your income every hour, for 1 day for coupons of 2 days, 3 days for coupons of 5 days.
We also plan to implement some forms of win coupons, as in special missions, random events, loots, etc.