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Deus Ex: Human Revolution is an action role-playing stealth video game developed by Eidos Montréal and published worldwide by Square Enix in August 2011. It is the third game in the Deus Ex series, and a prequel to the original Deus Ex. The gameplay—combining first-person shooter, stealth and role-playing elements—features exploration and combat in environments connected to multiple city-based hubs. in addition there are quests that grant experience and allow customization of the main character's abilities with items called Praxis Kits.

Set in the year 2027, Human Revolution focuses on ex-SWAT officer Adam Jensen, who is employed as security officer for Sarif Industries, a company on the leading edge of advanced and controversial artificial organs dubbed "augmentations". An attack on Sarif Industries that apparently kills researcher and Adam's ex-girlfriend Megan Reed also leaves Adam critically injured. To save him, company CEO David Sarif subjects him to an extensive augmentation procedure: six months later, now recovered and possessing advanced augmentations, Adam sets out to pursue his attackers and the shadowy organization behind them. The story explores themes of transhumanism, the growing power of megacorporations, and their impact on social class. It also uses the series' recurring cyberpunk setting and conspiracy theory motif.

A director's cut of Human Revolution, titled Deus Ex: Human Revolution – Director's Cut, was announced in April 2013. It was co-produced by Eidos Montréal, Australian developer Straight Right and Canada-based Snowed In Studios. One of the major changes was the boss arenas: while they could not create non-lethal options to take down bosses, the team created alternate strategies for players who took a stealthy and otherwise non-lethal path. They also made adjustments to the energy system, improved enemy AI, and upgrades to the lighting and shading systems.