You will need: something to divide the room off with (e.g. tape, chairs, benches, or tables) and a ball.
Split the room into four. Have one team in each of the four areas. The ball will be thrown between the four sections for ten seconds. The team that has the ball in their area when the countdown hits zero, loses a life. Each team gets three lives, after that they cannot win, but can still bat the ball out of their area. The last team standing, wins!