Five Nights at Freddy's 2
If you didn't die of a heart attack after playing the first episode, be aware that FNAF 2 is even more terrifying and that it will be more difficult to survive your 5 nights as a nightguard.
This time you'll have no security doors to protect you against the animatronics but will have to put on a Freddy Fazbear mask to fool them.
Constantly monitor the surveillance cameras and the 3 entrances to your office, turn on your flashlight if needed and don't forget to wind up the music box.
Five Nights at Freddy's 1
Five Nights at Freddy's 3