Amid the release of the Nintendo Switch title's, it's official website had released game sizes of notable games. "The Legend of Zelda: Breath of the Wild" was stated to roll out 13.4 GB while "Mario Kart 8 Deluxe" with 5 GB. Other games like "Dragon Quest Heroes" and "I Am Setsuna" were also mentioned as well. Details here.
Nintendo has shared new screenshots of "The Legend of Zelda: Breath of the Wild" on the legend of Zelda's official Facebook page.
