Zynga interview questions

Stats question over the phone, in person interview with 4 people, all SQL. Some questions about my background, some questions about past experience. Want to truly understand why you want to work at a game company.

Interview was based on totally DS-Algo. There were two rounds, both coderpad. First interview went well and asked questions on bfs and trie implementation. He seemed pretty impressed and cleared me for the next round. For the second round of interview, they asked me a design question for a game. The whole interview seemed well. Was asking all the doubts and he was clarifying all the doubts. And at the end all looked fine. They didn't ask me any questions about why part. I asked if they need more functionality with the current design or a better way and they said it's okay. It looked to me that everything went well. And I was actually happy with the interview. Apparently after an hour I got a call from HR saying you're not the fit they're looking for. My problem is in the interview they never mentioned what they are looking for, never questioned my approach also never asked me if I was going wrong somewhere. In the initial questions they asked some questions from where Ive no background. Instead of making the interview more interesting for discussion. Maybe they have their bias towards a particular design they know of.