I used a 100 amp panel for my game room, which is 2900 sq. ft. I have installed about 80 outlets scattered all over, many at neon-sign level, several in the ceiling (which is a 9 ft. unfinished, painted black). I have six pins on a single 20 amp circuit with the possibility of adding one or two more - because I have LED'd all of the machines which reduce power consumption substantially. Most of the rest of the circuits are 15 amp arc-safe breakers or GFI breakers (for the bathroom). I put a power meter on the wall to monitor power usage, which is very low as about 99% of the lighting in the room, including the machines, is LED.
All of the pin outlets are 4 ft. off the ground so no cords show anywhere. I'm a stickler about electrical cords showing. Always put in MORE outlets than you think you'll ever need. There really is no limit to how many outlets you can put on each circuit, since you'll only use what you need. Even after 80 in place, I wish I had put in more.
Ceiling outlets are very handy if you plan on putting perimeter lighting LED strings throughout. Using remote outlet controllers, I can turn on any of six zones for the LED lighting. Put them in every corner, and also floating within the grid of the ceiling at every 10 feet or so. You can float pinball machines in the middle of the room anywhere if you have a ceiling outlet hookup - no cords on the floor anywhere.
I used ceiling can lights scattered to provide even lighting, along with a few in a row over the pool table and a couple in the "family room" section with the fireplace. 65 watt flood LED lights only use 12 watts each, and don't produce any real heat.
As for heating, I have a gas forced air ducted heat system, but rarely use it, even in the dead of winter. The house is a raised ranch with the basement being aroung 4 ft. under the grade, and the heat from upstairs is very adequate for the basement.
Finally I did my floor in a "polyaspartic" material, similar to epoxy but more rugged. It's got about 80 lbs. of pure aluminum flakes mixed into the clear topcoat, giving it a "wet" appearance and very deep. It's first thing people comment on when they get in the room. Glossy bright, you can do it in any material or color, very cool and can take much abuse and heavy machines with no downside. Mop it to clean it as well.
Many different ways to design a room, so this is just the way if finally did my room, after building 3 different game rooms in past houses.
img011 (resized).jpgimg013 (resized).jpgimg018 (resized).jpgimg016 (resized).jpg