Dark Souls 3, "the spectacular conclusion to From Software's trilogy", has had the biggest launch in the series, shipping 3m copies.
Comparisons are slightly confusing because of shipped units versus sold - they confused me (thank you commenters). In a similar timeframe, but in the US and Europe combined, Dark Souls 1 actually sold 1.2m copies, whereas Dark Souls 2 only shipped 1.2m copies. Even with only shipped figures for Dark Souls 3, it seems the game is comfortably ahead.
From Software's thematically similar PlayStation 4 exclusive Bloodborne sold 1m copies in under two weeks.
Will you support Eurogamer?
We want to make Eurogamer better, and that means better for our readers - not for algorithms. You can help! Become a supporter of Eurogamer and you can view the site completely ad-free, as well as gaining exclusive access to articles, podcasts and conversations that will bring you closer to the team, the stories, and the games we all love. Subscriptions start at £3.99 / $4.99 per month.