SCP-087 (Haversine)

SCP-087 is a game played by Markiplier.

Game Information
SCP-087 is a small indie horror game, made in two days. It is based on an original SCP story, written by Zaeyde. You go down to endless staircase, while noises are getting louder and hallucinations appear more often. There is no end in game until player meet a monster in random level. (If you manage to avoid him, he will randomly spawn is random floor again.) Markiplier accidentally missed when he was attacked.

Episode

 * Stairwell from Hell