Game adder

for the game adder, does it add the game to your xbox live profile so you can now play it or is it just to unlock like a modding tool for it?

It simply adds the games gpd to your profile, making it look like you’ve played the game. If you’re a Diamond member you can then add achievements for that game with Horizon.

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can i add a game on to a flash drive through horizon so i can play the game?

That’s not possible unless the game or DLC is DRM free. The only full games I know of that are DRM free are Alien Breed 1, 2 & 3, 2 Serious Sam HD games, Doritos Crash Course and Harms way.