Game Description:The fate of the entire universe hinges on the outcome of your decisions in this epic sci-fi action RPG. Solve the mystery behind a looming threat, convince others that it's real, and prevent oncoming Armageddon. Explore the far reaches of the galaxy and fight blistering real-time, squad-based battles. Veer off the main storyline and explore undiscovered worlds of a massive scale where you'll find new life, valuable resources, lost civilizations, and powerful new technology. Mass Effect features customizable characters and intense visuals, and also delivers online excitement - log onto Xbox Live for downloadable content and achievement recognition.