Google Software Engineer - Internship interview questions

Found the secret foobar link after searching technical terms on Google. Finish level 3 of the challenge, got contacted by a recruiter. Had to fill out a questionnaire about background and interests and scheduled a phone interview. First phone interview went fine even though I did end up not getting the right answer on some edge cases. After a while, got contacted by the recruiter for a second phone interview. This one was supposed to be harder and it did not go well. Got a phone call saying that I was rejected after 3 days.