Brink is a first-person shooter set in the near future. Gameplay features the Smooth Movement Across Random Terrain, or SMART, system to allow fluid movement around areas. Both the single-player and online multiplayer campaigns are set in the dystopian Ark, a floating city that has been overrun with refugees. Players take either the side of the Resistance or Security to further that side's goals in the story, which is featured in both campaigns. In each missions, players play as one of four classes and complete selectable objectives depending on their position, skill, and progress. Brink is based on the id Tech 4 engine.