I had 5 interviews at Zynga to be hired as a product manager from industry. 3 of the interviews were with product mangers at Zynga and the remaining with senior management at the company.
The interviews with the product managers were focused entirely on specific games -- breaking down core mechanics, monetization and feature sets. Each lasted 30-40 minutes.
The interviews with the senior management were broader and encompassed a range of topics around the games industry overall.
I applied online. The process took 2 weeks. I interviewed at Zynga (San Francisco, CA) in Feb 2014
Interview
Applied online and had two rounds of interview over the phone. The first one was with HR person which asked just regular question. Second one was with a director which asked narrow and specific questions about my background and asked me a few practical questions and real situations and was testing me.