Emailed to setup a technical phone interview 2 days after being called. An hour before beginning, I got a phone call from them to remind me. It threw me into a bit of a panic at first and though I had timezones confused, it was unexpected. Hour later, I got the interviewer phone call. He immediately jumped into technical questions, really fast, back to back for about 15-30 minutes. I froze during some of the questions. Really badly on the EASIEST questions. I nailed the harder ones, but in my opinion (and I think they agreed), if you can't get the easy ones right it doesn't matter. It wasn't that I didn't know them - I definitely knew the answers any other time you could ask me, but I just babbled like a goof without thinking. Worst performance in an interview ever, and I'm not sure why I had such an issue that day. Still haunts me at nights how rediculous I probably sounded. The harder questions are the vector math questions. They expect you to know how to do vector math on the spot, or at least describe how to do some common operations and game tricks. There are some surprisingly obvious/easy questions in regards to general programming, but if you're like me and sometimes speak off the top of you're head like a goofball having a bad day, these questions will burn you. Got an email back the following week saying they decided to move on.