Depends on the number of kids and what they do. Playing drums in the same room as someone trying to focus on a high-adrenaline multiplayer FPS would never work (at least not very well). Separating into multiple rooms also allows kids to bring friends over and do stuff without disturbing the other kids. Also; kids needs time to be alone, multiple rooms allows them to do stuff by themselves without having be with others.

The music room has dampening mats on the walls to stop too much sound from escaping. It also has amps, drums, guitar stands etc. A purpose built room is awesome.

The second living room has darkened walls and tints on the windows. It has a project bolted to the ceiling and a screen that rolls down for movies, smash and mario kart (my kids are still young enough to think Nintendo are the only computer games :-)

Please don't be like this on HN.

https://news.ycombinator.com/newsguidelines.html