Roundnet is a sport played two vs two. It is commonly described as a
fusion of volleyball and four square, but it’s also known as “that
yellow trampoline game they play in parks”.
To start the game, a player serves by hitting the ball down towards
the net, to make it bounce up to the opponent on the other side. The
opposing team now has to return the ball to the net, within three
touches or hits. The game ends when the ball touches the ground, a
team can’t return the ball to the net within three touches, or an
infraction of the rules occurs.