Per 
Item #: SCP-6355
Object Class: Keter
Special Containment Procedures: SCP-6355 is retained in any sandbox game.
Description: SCP-6355 is an unknown killer that infiltrates the player’s world and begins to do terrible things. It looks like a silhouette with black eyes, and its goal is to scare the player. In a chance of exactly 000.1, SCP-6355 may say that it will come for the player. And in a chance 0000.1 will kill him. SCP-6355 may be friendly or angry. In a friendly version, on the contrary, he will help the player and try to make friends with him. But if the player refuses to make friends, then he will transfer to the evil version.
Addendum 6355-01: SCP-6355 in game Garry's mod.
<start story>
Good afternoon. I want to tell you my story about the mysterious killer that I met in the game Garry's Mod. My essence in the story was that I played a card that you can create your own homes. I created a maximum of 9. So I went into my house and arranged and began to live in it, and I also put the animals. Since I was bored here, I decided to pause the game and went to watch the video. After watching two videos, I decided to return to the game. What I saw, obviously I did not. The heart got into his heels, and goosebumps went on… The furniture was destroyed, the animals were killed… I was scared, but suddenly the console opened and I saw a strange message from the player (probably) with an incomprehensible nickname whom I made out called: " Killer "from the message: I will come for you… but before I abruptly closed the game I could see a dark siluet without eyes. He looked at me from the top floor through the broken glass and I was able to take a screenshot before he disappeared:
<end story>
