Deus Ex: Human Revolution is an action role-playing game developed by Eidos-Montréal and published by Square Enix. The game is a prequel to the original Deus Ex (2000) and the third installment in the Deus Ex series. The gameplay combines first-person shooter, stealth, and role-playing elements. It features exploration and combat in environments connected to multiple city-based hubs, in addition to quests that grant experience and allow customization of the main character's abilities with items called Praxis Kits.