Are you sure? How does it not work? Is there an error message? Do you get a black screen? What firmware of GW are you using? Is it using emuNAND? Did you deleting it and copying it over again? Did you try downloading it again?The USA dump doesn't work on gateway
I haven't tried it yet, so I'm not sure, but to my knowledge, every 3DS game that isn't an eShop dump works. I'll go ahead and try it out tomorrow, but by then someone will probably have already tried it and dismissed your claim or supported it. Too tired to do it right now~