Found this on CC - Scroll down to: For Kids - Lots of info.
Tweens on MSC Meraviglia
Young Club: This is for the "tweens" -- the 12 to 14-year-olds -- and operates differently from the younger kids' clubs, with programming only in the afternoon when in port and all day when at sea. Facilities include foosball, table tennis, PS4, some pretty cool double seats in which you lounge back to play video games from a TV in the ceiling -- and even some traditional board games like Cluedo. The most innovative piece of technology is a multi-media table which allows kids to post pictures and messages which then get screened on walls round the club -- rather than sit using their cell phones. Programming includes lip sync battles, generation games and sports tournaments in the Sportplex.
Teens on MSC Meraviglia
The 15- to 17-year-olds get their own private room which is adjacent to, but not a part of, the kids' club. It's a circular lounge which is effectively one big dance floor, where teens can hang out. It has plenty of chairs, huge TV screens, beanbags and numerous video games including PS4, Nintendo Switch and VR. Their programming is pretty light touch, again afternoons only (except on sea days) and will include generation games, dancing and sports competitions including mini-golf and ping pong. In the evening, when the adults start turning up at the next door Attic Club, the doors are closed.
Tip: Bring you and your children's own personal entertainment. TV on MSC is terrible. We brought our computer and streamed a lot of movie's. The tv is very, even less than basic. Have fun finding how to discover your billing account. Channels include all of MSC's info and shopping stuff. HGTV, Cartoon Network, TCM, CNN, Discovery, ESPN, etc. Bring your and your families favorite portable entertainment if possible. The TV is not movable from the wall so you won't be able to connect anything like HDMI to it. Like I said it's very basic.