Today, Sony Interactive Entertainment announced that PS4 exclusive Horizon: Zero Dawn from developer Guerrilla Games has sold (sold-through or sold-in not is not specified) 3.4 million copies as of April 30th.

As you may remember, back on March 16th, Sony announced that the game had exceeded 2.6 million units sold in its first two weeks on the market, making it the best-selling new first party IP launch on the PS4 ever and notably Guerrilla's biggest debut ever.

What this means is that in the roughly one-and-half months since opening two weeks, the open-world action RPG has sold another healthy 800,000 units, showing a decent post-launch month tail.

To put this number into perspective, the other biggest PS4 exclusive, Uncharted 4: A Thief’s End from Naughty Dog, sold 2.7 million copies in its first week on the market. The difference between the two is that Uncharted is an established and iconic IP dating back to the previous generation. Meanwhile, The Witcher 3: Wild Hunt -- 2015's GOTY juggernaut -- sold 4 million copies in its first two weeks -- but that was across not only PS4, but Xbox One and PC as well.

Comparing it to games released this year: Resident Evil VII is said to have sold over 3 million copies to date, and it launched back in January and on multiple platforms.

Horizon: Zero Dawn first released in North America on February 28th and then in other territories a few days later. It is available exclusively on PS4 and normally runs at $59.99 USD, unless it is being discounted. DLC for the game has been confirmed, but no details have surfaced as of yet.