Mass Effect was ported to Microsoft Windows and PlayStation 3 in 20, respectively. The game received several year-end awards, including Best RPG at the 2007 Spike Video Game Awards and Roleplaying Game of the Year at the 2008 Interactive Achievement Awards. Critics praised the game's interactive storytelling and cinematic design, but chastised its unbalanced combat mechanics and poor artificial intelligence. Mass Effect received critical acclaim, and sold over one and a half million copies by January 2008.

In 20, two downloadable content packs that introduced new missions to the base game were released. The combat was designed to offer the tactics and customization of a role-playing game, but through a simpler and real-time third-person shooter interface.

It was designed so that the player would assume the role of a central character that could make important decisions and impact the story of the game in numerous ways. Planned as the first chapter of a trilogy, Mass Effect was developed over the course of three and a half years, and uses the Unreal Engine 3 as a groundwork. The game involves completing multiple quests that generally involve space exploration, squad and vehicular combat, and interaction with non-player characters. The player assumes the role of Commander Shepard, an elite human soldier who must stop a rogue agent from carrying out the Reapers' galactic invasion. It is the first game in the Mass Effect series, and takes place within the Milky Way galaxy in the year 2183, where civilization is threatened by a highly advanced machine race known as the Reapers. Mass Effect is an action role-playing game developed by BioWare and originally released for the Xbox 360 in 2007.

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