SCP-087-b: Scary game for Halloween

My friends and I call SCP-087-b is called "Hallway Simulator 2012," for reasons you will understand if you look it up. However, it is not to be taken lightly.SCP-087-b is definitely one of the scariest games I have ever played, or even seen.

There is also SCP: Containment Breach, which I don't think would be as interesting to watch - but is also quite scary (and difficult).