In Brink, Splash Damage has created a world of two perpetually warring sides: the Security and the Resistance. Each is fighting for its own slice of a very small pie called the Ark, a floating city that remains the last bit of "land" on a flooded Earth. It was built to safely support a few thousand, but its ranks have swelled into the tens of thousands -- overpopulation and the two warring sides naturally brought about a conflict.

Each side has four different classes. There's the Medic, the Engineer, the Soldier and the Operative. The Medic doles out health and revives downed teammates, the Operative can disguise himself as a person on the enemy team, the Soldier can replenish his teammates' ammo, while the Engineer is tasked with maintaining the hardware. Every in-game action nets you experience points, which can then be used to purchase specific abilities (things like damage buffs, extra ammunition, etc.) and customize weapon loadouts -- quests are accessed through an in-game radial menu, which allows players to choose from a set of ongoing objectives on the fly.