One Week At Kristoof's
is a series of 4 FNAF fangames.
Early Demos for these games, and the full versions can be found here, the series is made by Tenth Circle Studios, coded by Kristoof and playtested by Oxdog, when you download the zip for whichever game you play, please read the README file before doing anything, as it contains crucial info on how to start, and play the game.
He is watching. Waiting.