Why fans rate this one

Type: a fan game, and one of the most respected in the series' orbit
Setting: a dark office you are shut inside
Tool: a flashlight, used to blind rather than to see
Goal: last as long as you can
Cost: free in the browser

TJOC: The Joy of Creation is not an official game in the series. Some people rate it above several of the official ones. You could call it another chapter in the story of Freddy Fazbear - it is genuinely frightening, genuinely difficult, and worth the time.

Freddy and the rest are loose again. You are locked in a dark office, and it is only a matter of time before they get through the door. Blind them with the flashlight and stay alive as long as you can in this survival horror built on Five Nights at Freddy's.

What sets it apart from most fan games

The presentation is a step above almost everything else in the fan scene
The torch is a weapon here, not a tool for looking around
There is no power meter counting down, so the pressure comes from the door itself
The rules it plays with are the ones set by FNAF 1, pushed harder

If you want the official games for comparison, they are all listed on the main page.