SCP-087

SCP-087 is an unlit platform staircase with each floor being a semicircle platform leading to the next flight of stairs. Light is required for exploration, as there is no lighting or windows present in the structure. Lights brighter than 75 watts are ineffective, as any excess light is absorbed. The staircase appears to have no end, and defies the space around it both structurally and geologically.

In-Game
SCP-087 in the game is an endless staircase. The goal of the game is to descend the stairs until you reach the final entity who presumably saves the main protagonist. Each floor consists of a platform with a number on the wall indicating the current floor, a handrail affixed to the wall on the right, and a guardrail on the left. The railing is made of metal, and the walls and floor are made out of concrete. The player holds a flashlight, which can illuminate a sphere around them roughly the distance of half a staircase around them. As the player progresses, the flashlight gets progressively weaker.

Floors 1-60
At the start of the staircase, the environment will be relatively tame, with no hazards. Your flashlight starts at full power, and the staircase looks clean. The only two entities that can appear before Floor 60 are Crawlers and SCP-087-J, although the latter spawns extremely rarely.

Floors 60-90
This is the range of floors where your first encounter with SCP-087-1 can occur. Some time after your first encounter, you will get a radio broadcast saying that the researchers are packing up, and that this is the last you'll hear from them. After this point, no more radio communications will take place. More than one encounter with SCP-087-1 can occur during this period, but there is always at least 1. Some background ambience can be heard although it isn't as loud and as eerie as the later flights get.

Floors 90-180
Throughout these floors, you will have constant encounters with SCP-087-1 and SCP-087-2. SCP-087-2 will only stay for a short amount of time at first, but will stay for longer periods of time the further down you progress. Additionally, the atmosphere of the staircase will change. At first, the metal railing will become cracked and rusted, then the walls will become increasingly more cracked with visible water damage. Your flashlight will also get dimmer, however it will keep the same distance that it illuminates of half a staircase. An eerie ambience will take form, getting more pronounced deeper down the stairwell, adding to the horror element.

Floors 180-250
At this level, SCP-087-3 can spawn, being very rare at first and eventually spawning much more frequently than SCP-087-1. SCP-087-2 will also be permanently present, making looking back or travelling back up impossible. The soundtrack will be at full force, and your flashlight will only illuminate objects directly in front of you.

Floors 250-300
After floor 250, SCP-087-4 will have a chance to spawn, getting more likely for every floor you travel. Encountering SCP-087-4 will end the game and give you the badge. The flashlight becomes close to useless, only able to illuminate the wall next to you, making it hard to even tell what floor you're on while on a platform. The flashlight is especially weak when close to Floor 300.