Mirror's Edge is a first-person action game set in a dystopian society ruled by a totalitarian regime that exercises a high amount of surveillance on citizens. The city has a clean look, with bright cold tone visuals that are mainly white with hints of orange. Players control Faith, a female runner who transfers information by moving over the roofs of the city as all other forms of communication are monitored. She grew up alone in the streets when her mother died during the November Riots and her father deserted her shortly after. She was taught as a little girl by a man called Mercury, who caught her breaking in and was impressed with her skills. Hunted down by government agents, she needs to find a way to free her sister.
The gameplay focuses on the freedom of movement, based on parkour principles. The game path is largely linear, but the controls are context-sensitive, allowing Faith to string up moves to build a fluid flow of movement. Players can run up walls, slide below fences, jump, vault, or climb using various objects as zip-lines. The camera spins and bobs up and down according to Faith's speed, and her arms, legs, and torso are prominently visible. The game is largely HUDless, making the experience more immersive.
The pace of the game is enhanced by features such as Runner Vision, which highlights environmental pieces that can be used as escape routes, and Reaction Time, a form of bullet time that slows down the pace without losing momentum. Faith can also engage in melee combat or disarm agents to grab their weapons. The game takes place both outside and inside buildings, with ten chapters in total. The story is furthered through animated films between missions, while a time attack mode allows players to compete for the fastest times.