No problem :) 1. Our ratio is about 1 senior developer to 2 juniors, although as far as organization structure we're fairly flat and in some teams it's more 1 to 1. Average team size is about 3 engineers. 2. Yes, every Wednesday was game day and we'd alternate through a number of card and board games. Now this happens more organically, people are setting up their own games and times. We (of course) have ping pong and pool tables as well. 3. We have about 16 people in our open space and at any time one or two have headphones on (max). The way we have the room laid out seems to cut down on ambient chatter.

If you're interested: We have 4 pods of 4, plus conference and lounge separating the room into 2 sets of 2. Each desk in a pod has roughly about 49 square feet of space, all desks are L shaped (ikea galant with extensions), facing out towards the corners. We have half-height cubicle-style walls between pods, otherwise no walls between desks (other than dual 27-30in displays). It seems to be just the right amount of privacy/openness/sound dampening. We're currently building out another identical one of these open offices in our extra warehouse (did I mention space in Texas is cheap?) to house a few more engineers who are still in private offices and in anticipation of hiring.