What was interesting about this series, was it was open-galaxy sandbox style game. As you met characters, made choices about which missions to undertake, spoke with characters throughout the games, and ended missions in certain ways with huge decisions affecting the future of certain characters or species, the game adapted with you. At the end of game one, there had been several hundred decisions, all of which affected which characters lived, died, or what their life trajectory was. Enter game 2, and all of those choices were imported and the timeline continued. Time and time again you saw choices you made in the previous game affecting your current one. Characters who died in game 1, were suddenly not present in game 2. At the end of game 2, all the choices of game 1 AND 2 were imported into game 3.