I was contacted on LinkedIn by a Microsoft recruiter, and encouraged to apply to their summer internship program. I had a phone interview a couple weeks later. The interview consisted of some behavioral/background questions. However, most of the questions were puzzles, riddles and design questions. There were no programming questions.

Three rounds of interview starting with phone screening, middle round of online interview and final round of three interviews all schedule within a couple weeks time. Interviews were Microsoft recruiters followed by employees