Sparrow King Square is a game mechanic, and is used to obtain rare items, like Flux Crystals, and various Balls and Handheld Pushers.
It runs in 5 minute rounds, and when a spaceship enters the square, they gain a timer icon below them.
When the 5 minute timer reaches 0, the spaceship with the highest time inside the square receives a sum of Flux Crystals, observed ranging from 10-100 units. A Green Bot also spawns inside the square for added competition, however easily overwhelmed.