We did FBI Interview with seven people, and I think it was a perfect number for the room. We didn't quite set the record, but we were close! Riddle Escape Room seems to focus more on intellectual challenges and less on the simple "find the key and open the lock" approach, which I really appreciated. I also like the fact that there were a lot of handcrafted electronics involved - it shows when you've got a designer or engineer who really cares about the experience. Music was themed and the room was darkened as if you were actually solving an FBI case.
I love an escape room that puts you in-character, and FBI Interview did that. 5/5, and my group will definitely be back for the others!