In a statement posted on Nintendo’s website, the gamemaker confirms that Super Mario Run was downloaded more than 40 million times in its first four days, setting a new App Store record. The endless runner has roared to success despite mixed reviews — our own App Diary had mixed feelings, as well. The Wall Street Journal reports Nintendo shares have fallen more than 16 percent since the game’s launch, with investors citing concerns over Nintendo charging a one-time fee, rather than using an in-app purchase model like the one that made Pokémon GO so successful. While Super Mario Run is expected to generate $15 million in its first month, Pokémon GO made $100 million between July and September by adding additional paid content. While expanding the game to Android could make more money for Nintendo, a company spokesman confirmed there are no plans to release any additional content for the game, either free or paid.