The story mainly revolves around the Milky way galaxy being invaded by alien creatures called the ‘Collectors’. It was launched for Windows PC and Xbox 360 in 2010 and then for PlayStation 3 in the succeeding year. It features a single player mode which involves an action, role-playing, third-person shooter gameplay. Mass Effect 2 is the second instalment in the series of video games known as the “Mass Effect” published by Electronic Arts and developed under BioWare and is powered by Unreal Engine 3.