Fallout Shelter is out now on Xbox One and Windows 10 PCs, but it's still up in the air if it'll come to PS4.

Fallout Shelter is a quirky little game that first launched on iOS and Android devices before the launch of Fallout 4. It gave players the chance to manage their own vault and ensure the survival of its citizens. A few days back, the game made the jump to Xbox One and Windows 10 PCs, but not PS4. So, where is the PS4 version?

Fans took to Twitter to ask Bethesda's head of PR Pete Hines to find out where the PS4 version is. Apparently, not even Bethesda is sure if it'll ever come to PS4.

Microsoft's Universal Windows Platform has made it easy to port from one Microsoft platform to the other, including Xbox One. As PS4 is not part of the UWP, it did not get the port. That isn't to say that there will never be a PS4 version. Mr. Hines' tweet did not rule it out, just that it is unknown if will happen.

Fallout Shelter is out now on Xbox One, PC, iOS, and Android devices.