Nintendo's 'Splatoon 3' has become the video game company's fastest-selling Switch game in Japan, with over 3.45 million units sold within three days of its launch. The game surpassed other Switch titles like 'Animal Crossing: New Horizons' and 'Super Smash Bros. Ultimate' in terms of initial domestic sales. Shares of the Kyoto-based company jumped around 5% on Tuesday.