Trick or Treat, Wastelanders! It's Halloween, at least in the mobile game Fallout Shelter. For a limited time, all vaults in Fallout Shelter come complete with Halloween decorations sure to get any vault dweller in the spirit of the spooky holiday.

Players who log into the game today will see that their vault dwellers spent the evening decorating and now all vaults have a nice creepy vibe complete with jack o'lanterns, witches, skeletons, spider webs and bats.

However, this could mean that a new kind of evil will eventually show up at the vault door, too, and try to raid the vault. The game hasn't yet seen ghouls turn up, or even super mutants, so perhaps that's something players can expect soon. Good luck with that.

Bethesda Softworks released the mobile game this summer shortly after announcing Fallout 4, perhaps to keep fans of the franchise entertained until the latest game arrives. Fallout Shelter is a weird little game that mixes the world of Fallout with The Sims, but adds its own unique brand of survivalist horror and humor.

For example, one of the important things that vault dwellers can do in Fallout Shelter is have babies, so players must spend time having two dwellers getting to know each other so that children get born. That seems a little barbaric and extremely misogynistic, but the world of Fallout is one still mentally stuck in the 1950s.

Fallout Shelter also relies on the player to make sure that vault dwellers have all the resources they need, including weapons, because vaults get raided often. Deathclaws and Raiders show up at vault doors at regular intervals, and that rarely ends well for those living in the vaults.

There's also a lot of strange dialogue, much of it funny in a way that only Fallout fans would enjoy.

Of course, after about 10 hours of play, the game can feel a little tired, but perhaps the Halloween decorations are a way for Bethesda to keep players entertained, especially with the release of Fallout 4 just around the corner.

Bethesda also recently released a new update for Fallout Shelter, too, one that included some new features, content and bug fixes, as well as a harder survival mode and cloud saves.

Fallout Shelter is available now for iOS and Android. Fallout 4 comes out on Nov. 10.

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