Defeat the enemy fleets of spaceships that are hiding in the asteroid belts.
The game has an in-game interactive tutorial.
You control a squad of ships and will fight an enemy which is hiding in the dustclouds of an asteroid belt. Everytime the enemy fires at your fleet, you'll gain some information about the enemy's whereabouts. Let your ships take turns firing back so the enemy doesn't gain too much knowledge about your location, too.