The best invention in the world is UNO cards. As long as they know their colors and a few numbers, they can play. It helps pass the time with my neices and nephew. It has worked on many outings. I hunt with all of them at times in a blind. That is four kids.... A homemade one works out of several burlap sacks and some 2x2s. They can move around, but you have to give them the whisper rule. I refer to mine as the fort. They love it. I just can't climb in a stand with all of them, that's a bit dangerous as much as they like to move around. We even have a plywood floor in mine. My friends think I'm nuts, but I know they will remember the effort I made to include them in the sport I love. There is nothing better than taking a kid in the woods for an afternoon of clean fun.