Coupons can be registered by following the below steps.
■ How to register coupons
1. Menu at the bottom of the screen → Account Info
2. Press “Enter Coupon” and input coupon code
※ Coupons can only be used once.
※ If you don’t see the Enter Coupon button, please use the link below to enter your code.
[ Enter Coupon ] ← Click
Coupon link: https://coupon.kakaogames.com/worldflipper/en