The New York Times newspaper reported last Friday that 10 million people downloaded the Pokémon Go game in its first day of release in Japan last Thursday.
In addition, data gathering company SensorTower revealed that the game has 75 million downloads worldwide.
The game is now the fastest mobile game to reach 50 million downloads.
The Pokémon Go app launched in select countries including the United States on July 6, and has since launched in more than 35 countries.