Spikeball is a recently-invented game that developed from volleyball. A webpage from Southern Arkansas University summarizes the rules. Two teams of two players each surround a circular let. Each person bounces a ball toward his/her partner. The partners can touch the ball up to three times before it must be served again at the net.
As you can see, this is similar to volleyball. But one core difference is that there are no fixed sides. Players can move around each other, seeking the best angles to serve and receive the ball. When one team loses control over the ball, the other team receives a point.
-via Massimo
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