Lots of games have special events or updates that change the game in some way for Halloween. Some of them are pretty impressive, so I wanted to make a thread where people could point out some of the best ones.

Have you seen any interesting updates/events in the games you're playing/watching?

Please make a separate top-level comment for each game/update so we can easily separate discussion about a particular game.

What horror or dark-themed games would you recommend, and why? No spoilers please.

Steam: https://store.steampowered.com/sale/halloween2018/

GOG: https://www.gog.com/games?page=1&sort=popularity&tab=on_sale

Humble store: https://www.humblebundle.com/store/promo/halloween-sale/