Niantic Software Developer interview questions

One phone interview about background experience& general algorithm question, then I go to on-site interview in Sunnyvale office. On-site interview is writing a plugin for Unity by c#& c++, not sure why they make people go to the office and sit there for coding with a Mac over 3 hrs. Almost no interaction during the process and they even don't have clear design requirement& instructions for the coding question, so I doubt that they probably even don't know what they ask. Besides for people who never write plugin for Unity, the syntax problem is really a big pain and a huge waste in time. No need to mention I didn't use Mac and totally uncomfortable with IDE they use. Last round is a presentation for explaining what you do, I am pretty tired in that time and totally don't know what they wanna ask and test. Haven't hear back but I don't think I could get an offer.