Interview was tough and intricate, but it was nothing out of the ordinary. Everything you've heard about Google's interview process is both true and false. I would go in with a fresh and clear perspective and not let past examples bog you down.
standard 1st round digital interview, they are asking about your experience, background, some behavioural questions and technical questions. and they also share a bit more about the role, culture and expectation
Very self-driven, first of multiple rounds, where I had to take the initiative to arrive at the problem, constraints, approach, solutions, tradeoffs and reasoning behind it in a matter of 30 minutes.
You would have to do a hiring assessment first, then a recruiter screening follows. First round interview with the hiring manager. Majorly product sense and product improvement. The questions were not direct though.