We’ve 5 grandsons, no girls in the mix, and I’d agree that if it’s at all possible they need to get outside in the fresh air and just run some energy off. If it’s pouring down and they’re stuck indoors though, ours just shoot upstairs when they’re together and do whatever the heck they do in the spare bedrooms. We’re lucky in that we’ve accumulated a lot of toys, puzzles etc from charity shops over the years, but from the clearing up afterwards it looks as though dens and made up games are usually the order of the day. If we’ve just got a couple of the boys at once, baking’s one of the few calming activities I can rely on. Treasure hunts are good, but over very quickly for the effort involved. Ours are too old for play dough, but that used to be a winner. Good luck - have fun!