You probably heard these game series made by Scott Cawthon, the Five Nights At Freddy's (FNAF), which has been played by Pewdiepie, Markiplier, Smosh, and many more.
TBH, I'm not really a gamer, probably because I get bored with games easily, and I get grumpy if I lose to a single stage which kinda leads me to uninstalling the game, and hence, stopping me from continuing.

I never tried any horror games so far, except for Slenderman, in where I only get 3 pages and start getting grumpy (I hate you Slenderman) because I kept finding it difficult to get the fourth. Although I know games have to get harder as the player progress, but I'm not really the type to always agree on it, and when I'm in a bad mood, I eventually just rage quit.

My second horror game, FNAF2, was just something I wanna know what it feels like to play in real life. Normally, I would just watch people play, and you know you will get that tingling sensation inside of you in where you think "Oh, it isn't so hard. I can definitely play this!"
And it became your worst decision you've ever made in your whole life. Imma be real, I'm not scared of horror films, but when I watch others play horror games, I get freaked out. One probable reason would be that movies have set plotlines, and you can predict how the story goes. As for games, you make decisions, and wrong ones usually lead to loss, or in this case, jumpscare.

Believe it or not, I almost quitted FNAF2 when I started because I didn't understand how and why I lost, but it eventually got over and I won the first night which felt like I just arrived at Heaven with thousands of angels singing "Hallelujah", and puffy clouds surrounding me.

At this point, I kinda get the feels for how much effort Mark, Pewds, Jack, and other gaming Youtuber have made to give us some entertainment. Now I appreciate them even more. And some of you probably know that FNAFs has some secrets that reveals its unexplained background. Since I never played it that much, I watch Game Theorist who has been explaining it amazingly so far. He has made a LOT of effort on these videos
Of course, this is just an explanation for FNAF 1, the rest are in separate vids. To watch the others, you can just go to their YT channel or just click HERE! directly. BTW, they're making a movie based on this game series, just to inform. ENJOY!