This Game should be done Outside.

25-50 small water balloons.
Volleyball or Badmitton net
Enough beach towels for every two participants.

Fill ballons and tie. Use a 5-gallon bucket or a plastic laundry basket to carry.

Divide the group into even teams. Each side should have at least one pair of players.
Each pair should hold two corners of a towel on the short side.
The Judge will place a water balloon into the towel of the serving team. The servers will pull back on the towel and throw the water balloon over the net to the opposing team. The other team will try to catch and then throw the balloon over the net to the other side.
Score as you would a volleyball game or based on water balloons broken per side.