"We went through all the boss battles and said, 'let's just start from the beginning,'" Pedneault says. "So that's exactly what we did."
Each of the game's three boss fights have had their map layouts reworked to provide players with alternative potential strategies. New hacking challenges are available to players who focus on hacking, and stealth options are available to those who focus on stealth.
POTENTIAL SPOILERS AHEAD: You can now kill Lawrence Barrett, Yelena Fedorova and Jaron Nammir without firing a single bullet. "We took the whole experience Deus Ex gave you and we applied it correctly to the boss fights," Pedneault continues.
Many found Barrett, for example, a particularly tough difficulty spike on account of his high damage, relentless pursuit of the player within a tight hanger. This map has been reworked to provide a second additional layer so Jensen can hide, forcing his foe to lose sight of him.
Understandably Eidos Montreal wasn't able to provide players with the option to not kill the bosses, although it sounds like it would have liked to, because the game's story couldn't be altered.
"They have to die," Dugas says, "but the fact is you're not forced to go full-frontal with them. You can just use some of the devices or tricks in the rooms to eventually kill them without having to spend your own bullets."