Featuring 9 massive single-player maps, 8 additional Survival Maps, play it all in both PC and VR!

https://store.steampowered.com/app/747690/Sinister_Halloween/

Get the terrifying Asylum Experience

A complete additional single player campaign add on with 9 additional mini maps. Featuring a complete new location and separate but related story for a more polished horror experience.

https://store.steampowered.com/app/1453070/Sinister_Halloween__Asylum_DLC/

Developer Note. A December update is in the works. Hopefully just in time for the holidays.