It's a difficult question, if week 4 is higer than week 3 (which is higer than week 2)...holy god! I knew the game was gonna reaching 3 millions but I didn't think that fast...
Anyway I'm gonna saying lower than both week 3 and 4, but without a specific reason, just I think it will sell 350-400k, but near 600k seems too much IMO in the 4th week of a game. even if it's a 2d Mario.