H1Z1 - which has been dubbed “the original standalone Battle Royale game” - was released on PS4 on Tuesday as a free beta download.

After launch developers Daybreak Games revealed that in its first 24 hours H1Z1 was downloaded by more than 1.5million fans on PlayStation 4.

And now they have revealed that since H1Z1’s release on PS4 on Tuesday it has amassed over 4.5million players.

The official H1Z1 Twitter posted: “[PS4 Open Beta] As a THANK YOU to all 4.5 million+ of you who have joined us since Open Beta launch, we've dropped the Blue Barbed Hellfire 4-6 right into your inventory!”

The game’s official Twitter account revealed that, following this landmark, the H1Z1 duo mode has gone live.

The H1Z1 Twitter added: “PLUS, Duos is now unlocked with a brand new patch”.

Patch notes for H1Z1 version 1.14 were published in a post on the game’s Reddit page.

Introducing it, community manager Lieutenant_Toast wrote: “Thank you to all who have joined us for Open Beta testing on PS4 so far - all of your feedback has helped us enormously in tracking down issues!

“We've just pushed a new update out (Version 1.14) that you'll be seeing shortly - here's a round-up of what's included in this patch (as well as a few highlights from patches earlier this week)”.