Level 9223372036854775807 - The Escherian Stairwell, Escape The Backrooms Wiki

Safe No Sanity Risk Devoid of Entities Level 9223372036854775807, also known as The Escherian Stairwell, is seemingly an infinite stone staircase with openings where a white void can be seen. It is currently undetermined in size. Nobody has been able to reach the top, so it leads many to believe that it's infinite. Each level has a number corresponding to its floor number. All numbers change to infinity symbols past floor 99. It has been theorized that this is the deepest level in the Backrooms.

Number Lock, Escape The Backrooms Wiki

Steam Community :: Guide :: Nightmare guide in order (3.10 Version)

Steam Community :: Guide :: Full game guide in order (3.10 version)

Level 9223372036854775807, Escape The Backrooms Wiki

ArtStation - [Back-Rooms] Level 9223372036854775807 [Scene Art]

Steam Community :: Guide :: Full game guide in order (3.10 version)

Level 9223372036854775807, The Backrooms (Fanmade) Wiki

Full Game Guide, Escape The Backrooms Wiki

Steam Community :: Guide :: Full game guide in order (3.10 version)

Nightmare Mode Guide, Escape The Backrooms Wiki

Level 6 - Lights out, Escape The Backrooms Wiki

Level 6678, Backrooms Freewriting Wiki