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no they are just for gamer score (GS)
25G is the gamer score (known as achievements). All games have this gamer score.
You gain achievement points for completing achievements, thus raising your gamer score.
Any multiple of 5 from 0 to 1400. 1400 is the maximum gamer score for this game.
You have to get 1000 gamer score.
Nothing, unless you actually care...brag
The gamer score does not tell someone how good a player is. The gamer score only shows people how many games they have played and what achievements they have gained when playing the game.
You have to get 1,000 gamer score on Halo 3.
IT gives you gamer score points and you get them in forge mode
Yes. On a unintentional deflection...
you can't spend your gamerscore, but you can spend Microsoft Points which can be bought from Xbox LIVE marketplace for various amounts of money - i think 800 is £10.
Gamer score updates automatically when you log in to XBox live.