Interview process was very traditional. One of the project member warmed me up with some basic questions, mainly focusing on high school physics' concepts. After probably 15 minutes, the main interviewer walked in with a laptop asking quite similar questions to the first interviewer, in addition to some soft questions.
Overall, I believe it could have been a successful interview on two accounts-
1) I should have meditated before I walked in. :)
2) It would have been nice, if the recruiter didn't try to hide the team/project information, so the candidate can prepare ahead to the type of mindset is required to solve those problems.
First question/comment out my interviewer mouth was- "so, you know which project you are interviewing for, right?"
In any case, it was a positive interview experience. Both of my interviewers were highly professional and patient through out the interview. I would definitely apply for another position at Google.