Five Nights at Freddy's
If you're a fan of cult classics or want a typical "jump scare" than Five Nights at Freddy's is the game for you.
There are actually five different games in the series, so you have tons of content and games you can play throughout the entire month of October, or anytime of the year, really. Just like the slasher titles from the 80's, Five Nights at Freddy's should invoke some fear into anyone that plays them.
Because these games are so good you can find an entire community on YouTube, Reddit, and other forums talking about each game, how to beat them, etc. So, head to the Pizza Parlor and watch out for those animatronic teddy bears trying to kill you.