Luigi’s Mansion: Dark Moon sold over 415,000 copies in the U.S. during the month of March, Nintendo have shared with Siliconera. The game was released on March 24th.
Nearly 365,000 copies of the game were sold at retail, according to Nintendo of America. That means about 50,000 additional copies were sold as downloads via the Nintendo eShop.
Additionally, Fire Emblem: Awakening sold another 64,000 copies (both retail and digital combined) in its second month, bringing total sales in the U.S. to over 240,000 copies.
Finally, Pokémon Mystery Dungeon: Gates to Infinity, released on the same day as Luigi’s Mansion: Dark Moon, has sold 145,000 copies between retail and download sales.