Back when we were all anxiously awaiting an in-depth look at Fallout 4 at Bethesda Game Studios’ E3 2015 presentation, Bethesda’s Todd Howard dropped a little surprise on everyone: they had been also working on a mobile game set in the same universe titled Fallout Shelter, and it was going to be released that very same night.

The game was released for iOS, Android, and PC, and did pretty darn good. Now the game is available to even more people with its release today on Microsoft’s Xbox One and Windows 10. And yes, just like the previous release, it is free to play.

Continue below for more and to watch a trailer.

One of the announcements that was rumored for Bethesda Softworks’ E3 2016 presentation was a remastered version of The Elder Scrolls V: Skyrim. That rumor has indeed been confirmed in a video, which shows the game as it looked on the previous generation of consoles and how shiny new and pretty the Skyrim Special Edition looks remastered on current consoles. The video also confirms that, like Fallout 4, this new console version of Skyrim will have mods. The Special Edition will also be released on PC as well, so this is not just about giving console players an updated version of the game.

Speaking of Fallout, before the Skyrim announcement the rest of Fallout 4‘s DLC was announced, including one add-on that will let you build your own vault and basically re-create Fallout Shelter in the game and also one last big one that involves a Nuka-Cola theme park!

You can check all of this out in the video below.

Bethesda won last month’s E3 game convention, according to most, holding their own showcase for the first time and unveiling games like the massively anticipated Fallout 4 and the new DOOM, among others.

One of the surprises that Bethesda delivered to fans during the showcase was that, in addition to Fallout 4, they also created their very own mobile game set in the same universe titled Fallout Shelter. On top of that, it was revealed that the game was actually already completed and would be available for download that very same night for free. Some Bethesda fans weren’t fond of the announcement, as mobile gaming has an overall bad reputation for the pay-to-win structure or overwhelming amount of ads found in many titles, but the developer assured fans that the game would have no ads and only optional purchases for items that could be earned in-game.

And apparently that’s all you need. According to mobile gaming data, Fallout Shelter made an astonishing $5.1 million in its first two weeks available to download.

One of the surprises Bethesda announced at their E3 2015 showcase was their very first touch screen game, and it is inspired by the beloved Fallout franchise. A franchise which of course also has a small game titled Fallout 4 on the way that was also featured to the great excitement of fans of the series.

The game is called Fallout Shelter, and in it you create your own Vault-Tec vault and play as the overseer of that vault people are living in after the apocalypse—a setting fans of the series are very familiar with. It’s up to you to manage the vault and do what best ensures yours and your people’s future.

The best part? This is a game you can get right this very moment for iPhone and iPad, without paying a single Nuka-Cola cap.

Click on over to the other side to see the announcement trailer for Fallout Shelter.