After just one week on store shelves, Super Smash Bros. Brawl for Wii has become the fastest-selling video game in Nintendo of America’s history. Since its launch on March 9, the fighting action game has sold more than 1.4 million units in the United States, including more than 874,000 on March 9 alone.

“Super Smash Bros. Brawl has made the leap from video game to cultural phenomenon,” said Cammie Dunaway, Nintendo of America’s executive vice president of Sales & Marketing. “Game reviewers and the public alike praise its fun game play and extensive, inventive content.”