The Mass Effect franchise is known for its branching dialogue and storylines, all of which eventually lead to numerous variations on each game’s ending. This was a fact with all three of the original games, and will likely continue in the fourth.
Mass Effect 2, arguably the best game out of the Shepard trilogy, had, “hundreds of player choices to account for that resulted in thousands of possible scenarios,” the game’s developer’s recently wrote on the BioWare Blog, “As work on [Suicide Mission] progressed, it was like trying to unspool a spider web.” ““It started out utterly broken to the point where it was totally unplayable and we looked at each other and thought, ‘I don’t know what’s going on. We’re not going to be able to ship this game. This is crazy,’” Lead Cinematic Animator Parrish Ley added, “and we would play it and go back to our desks and work on it. And every day it would get a little bit better, and a little bit better.”
BioWare Montreal is currently developing Mass Effect 4, which will be published by Electronic Arts presumably for the PlayStation 4, Xbox One, PlayStation 3, Xbox 360, and PC. You can check out more of what Mass Effect‘s developers had to say about producing the franchise in the link above or below.