Conversations between characters feature a variety of responses, with options in conversations and at crucial story points affecting how some events play out. 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 to quests that grant experience and allow customization of the main character's abilities with items called Praxis Kits. It is the third game in the Deus Ex series, and a prequel to the original Deus Ex. Deus Ex: Human Revolution is an action role-playing video game developed by Eidos Montréal and published worldwide by Square Enix in August 2011 for Microsoft Windows, PlayStation 3 and Xbox 360: a version for OS X released the following year.