I was handling, Kaskus ads banner for budget $5500 media placement, the design require lot of work to engaging user acquisition at Kaskus, The process very challenging, I try to use a scientific approach with A/B testing process.I create two design and try to compare with each other banner by analysis conversion. We decided to go to the first week with “A” banner and the result it significant around 1000 user reach. and then we try with the Banner B. The hypothesis if we adopt Ui design Kaskus the user will adopt as a part of element visual at Kaskus psychologically, user will interact with the banner as they comfy with the interface. And the result is outstanding we reach over 7000 users engaging to the banner.