"Description: SCP-087 is an unlit platform staircase.
Stairs descend on a 38 degree angle for 13 steps before reaching a
semicircular platform of approximately 3 meters in diameter. Descent
direction rotates 180 degrees at each platform. The design of SCP-087
limits subjects to a visual range of approximately 1.5 flights. A light
source is required for any subjects exploring SCP-087, as there are no
lighting fixtures or windows present. Lighting sources brighter than 75
watts have shown to be ineffective, as SCP-087 seems to absorb excess
Also, just read this document regarding SCP-087:
What makes this game good, like slender, is the only thing the player can do is move. No jumping, no flashlight or lantern even. The "music," sounds, voices, and the sheer anticipation make this the scariest game I've played.
This game is different than SCP: Containment Breach, and in my opinion - far scarier. The dungeon is randomly generated every time a new game is started (like SCP: CB, Slender, etc), which ensures a frightful experience every time.
Honestly, I'm not sure if it could be played for 2 hours - but it would be great in conjunction with another scary game (such as SCP: Containment Breach).
This game is 100% free, and well worth the download!