you could mod it in horizion or you can just play games like csi or any games like those.

Gamescore is easy to get just play the games. dont mod it coz iv seen a few people banned for modding it

I guess you can mod it.. but that's just pointless

Don't bother with modding your GS, two of my accounts
got the GS reset and the gamer zone changed to "cheater". Its not hard doing it legit, my legit and
first account has over 37k, I'd have a lot more if didn't
play the same 2 games for like the past year or so.

Avatar last airbender 1000 gamerscore in 2 minutes then you pop the game out and break that **** in half hahahahah

I have to admit, I modded mine a long time ago using Horizon. I told people about it and they told me I was going to get demoted to ' Cheater ' on Xbox. I still haven't to this day. I have about 55005 GS right now.

rent old games complete them and rent more, easy, and if your like me then you can get store credit after every rent sometimes