Going to say 1million. Brawl will sell better here then in Japan. If the game managed to sell 1million in 11 days, then 1million in a week is possible. I say at least 2million in a month.
It won't beat Halo 3's 1st week sales, but in the long run, I doubt be it worldwide, but I use that lightly. If it can break 2million in Japan, then it has a good shot.









