Creating a new installment in the Deus Ex series is ambitious by definition. To meet the lofty expectations of fans (who’ve been perpetually on guard since 2003’s disappointing Deus Ex: Invisible War), the games need to deliver freely explorable, believable worlds; unique characters who react to (and remember) your actions; multiple paths through their environments and multiple solutions to every problem; and smart, cleverly written storytelling rife with philosophical ruminations on the relationship between humans and technology.