Mass Effect 2 is an action role-playing video game developed by BioWare and published by Electronic Arts for Microsoft Windows and Xbox 360 in 2010 and PlayStation 3 in 2011. It is the second installment in the Mass Effect series and a sequel to the original Mass Effect. The game takes place within the Milky Way galaxy during the 22nd century, where humanity is threatened by an insectoid alien race known as the Collectors. The player assumes the role of Commander Shepard, an elite human soldier who must assemble and gain the loyalty of a diverse team to stop the Collectors in a suicide mission. Using a completed saved game of its predecessor, the player can impact the game's story in numerous ways.
For the game, BioWare changed several gameplay elements and further emphasized third-person shooter aspects, including limited ammunition and regenerable health. In contrast to the exclusive focus on the main story of the original Mass Effect, the developers opted to create a plot where optional missions had as much intensity as the main mission. Mass Effect composer Jack Wall returned to compose Mass Effect 2's music, aiming for a darker and more mature sound to match the game's mood. Mass Effect 2 also supports a variety of downloadable content packs, ranging from single in-game character outfits to entirely new plot-related missions. Notable packs include Kasumi – Stolen Memory, Overlord, Lair of the Shadow Broker, and Arrival.
Released to critical acclaim, Mass Effect 2 was praised for its presentation and cinematography, diverse and complex characters, and improved combat over its predecessor. Some critics, however, expressed concerns about the game's simplified role-playing mechanics. The game received numerous year-end awards, including Game of the Year at the 14th Annual Interactive Achievement Awards and Best Game at the 2011 British Academy of Film and Television Arts Awards. Mass Effect 2 is considered a significant improvement over its predecessor and one of the greatest video games of all time. A sequel, Mass Effect 3, was released in 2012. In 2021, Mass Effect 2 was remastered as part of the Mass Effect Legendary Edition.
