Coupons can be entered by following the below steps.
How to enter coupons
1. Menu at the bottom of the screen → Account Info
2. Press “Enter Coupon” and input the 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.
Coupon link → https://coupon.kakaogames.com/worldflipper/en