Google

I applied through their career website with a referral and went through 4 rounds of DSA. I was able to clear 3 rounds. The difficulty was average; LeetCode medium and hard problems would be enough.

All the questions are very difficult. There is no chance for a fresher who has no knowledge to clear the interview without a year of practice, many internships, and as many cool projects as possible on their resume.

Introductory Call -> Screening Round -> 4 technical rounds -> 1 Googliness round. If you performed not so well in the screening round but they didn't reject you outright, they might offer a few more months of prep time to reappear for the screening