Xbox Live - User Information - Gamerscore

Gamerscore

The Gamerscore (G) is an achievements system that measures the number of Achievement points accumulated by a user with a LIVE profile. These Achievement points are awarded for the completion of game-specific challenges, such as beating a level or amassing a specified number of wins against other players in online matches.

Initially, retail Xbox 360 games offered up to 1,000G spread over a variable number of Achievements, while each Xbox Live Arcade title contained 12 Achievements totaling 200G. On February 1, 2007, Microsoft announced on their Gamerscore Blog some new policies that developers must follow related to Gamerscore and Achievements in future releases. All regular disc-based games must have 1,000 Gamerscore points in the base game; the title can ship with fewer than 1,000 points, but anything added later must be free. Game developers also now have the option of adding up to 250 points via downloadable content every quarter after the first year of release (for a total of 1,750 points). Xbox Live Arcade titles must have 200 Gamerscore and may add up to 50 points via downloadable content (for a total of 250 points).

On May 26, 2007, Halo 2 was the first Games for Windows title to feature Achievements, which counted towards a player's Gamerscore.

On March 25, 2008, Microsoft cracked down on "Gamerscore cheaters" (those who used external tools to artificially inflate their Gamerscore), and reduced their Gamerscores to zero without the option to recover the scores that had been "earned", and branded the player by denoting on their Gamertag that they were a "Cheater".

The development of the Gamerscore system has created a new niche in the internet economy. Many websites have been created to provide gamers with tips and tricks for getting achievement points. Some sites are solely devoted to these achievement guides, and some blogs provide gaming guides in addition to their other content.

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Gamertags - User Information - Gamerscore
... The Gamerscore (G) is an achievements system that measures the number of Achievement points accumulated by a user with a LIVE profile ... On February 1, 2007, Microsoft announced on their Gamerscore Blog some new policies that developers must follow related to Gamerscore and Achievements in future releases ... All regular disc-based games must have 1,000 Gamerscore points in the base game the title can ship with fewer than 1,000 points, but anything added later must be free ...
Dash Of Destruction
... The game is regarded as the easiest game to earn all achievements and Gamerscore points out of all XBLA titles released ... references this several times in dialogue with the player, such as telling players to "get their Gamerscore on" and to "go on a Gamerscore rampage" ...