Zerg Soccer stands in contrast to the notion that the zerg are a malicious species with no sense of humor or fun. While they are quite malicious, some cerebrates have demonstrated both humor and a desire for pure recreation. The recent popularity of soccer among the Swarm is a prime example. Besides sporting a name even a hydralisk can pronounce, it gives opposing broods an opportunity to compete safely, and it has recently surpassed Pin Your Tail Through the Terran as the zerg sport of choice.
Zerg Soccer is similar, albeit in a warped way, to its terran counterpart. Each cerebrate aims to guide "Da Ball" (a protoss zealot) into the opponent's goal, receiving a direct kick if the zealot reaches the opponent's end line. By the end of the game, the cerebrate with the most goals wins.
July 10, 1998. Zerg Soccer StarCraft Compendium: Map Archives.