Flyland Wars: 0 Ball Game [Trainer]

You can fly! Flying is fun, swooping and soaring, going as fast as you want over, under, around and through things. You point in any direction and your anti-gravity rings fly you that way. But flying is also very dangerous! Touch anything, at almost any speed, and you're dead-- splat!
The time is the 26th Century. The place is a 'flyland,' an adjustable-gravity, half-kilometer-square surface high over an ocean, far from any land. This flyland, Ball Game, once a sports arena, is utterly flat and featureless, making it a good place to learn how to fly-- so it is your 'Trainer.' Not that it isn't dangerous...
Flylands were once the playthings of trillionaires, who were usually enriched by mining the wealth of the solar system using anti-gravity. The inventor of flylands, and a-grav technology itself, also made an immense low-gravity space colony, but it became diseased, forcing tens of thousands of gravity-weakened refugees to invade the only place...