How Mass Effect 3's Galactic Readiness System Is Changed In Legendary Edition The Galaxy at War system in Mass Effect 3 linked together single-player, multiplayer, and mobile apps, but it's all different now. The original three Mass Effect games always influenced each other as part of one long, expansive story. But with Mass Effect: Legendary Edition, BioWare has implemented changes that make your choices matter even more between games. That's most true in Mass Effect 3, where everything you do in Mass Effect 1 and 2 matters greatly to what happens at the end of the game, thanks to a change t...