Sucker Punch Productions' Ghost of Tsushima has been a smashing success for Sony, as the game has sold more than 5 million copies since launching on July 17 for PlayStation 4.

In fact, Ghost of Tsushima is the PlayStation 4's "fastest-selling first-party original" game, according to PlayStation Worldwide Studios head Hermen Hulst. Hulst made the announcement on Twitter, congratulating Sucker Punch on the "incredible achievement."

This metric is an increase from the statistic PlayStation shared in August, in which the company said Ghost of Tsushima was the "fastest-selling new IP." The open-world samurai action RPG sold more than 2.4 million copies within just the first three days of its launch.