We started this in a small room but as our church grew, we’ve continued to play it in a larger room so it works in both. It can also work with large groups of kids as well as small. Line up chairs (only one chair high)in a row to use as a net. Have the chairs face alternating directions across the net. Play with a light weight beach ball and use volley ball rules except for each side can hit it as many times as they wish as long as it doesn’t hit the floor. You can play off of anything in the room except the floor. No spiking. If the ball lands on one of the chairs being used as the net, you hit it until it until it goes across on one side. As many or as few on a team. These rules seem to even the sides for the less athletic kids so everyone has a good time.