Spike the ball. It’s that simple. The sport of roundnet, a.k.a. “that yellow trampoline game” a.k.a. “if volleyball and foursquare had a baby” a.k.a. “enough with the wit I’d like to read the rules,” is played 2 vs 2. A player starts a point by serving the ball down onto the Spikeball net so it ricochets up at his opponents.