i) Backrooms Sublevel 1-4 - teia

Deep entry of Level 1, this is an evil twin of first layer, accessible via unfortunate string of events. Use W,A,D or arrow keys or HUD arrows to walk. Space for zoom-in, R for restarting scene. twitter.com/PlyLop

Level List, Backrooms Wiki

Level 1, The Ultimate Backrooms Wiki

Steam Workshop::level 4 (terraria backrooms)

Level 234 - Detention Dimension - The Backrooms

Level 41 - The Black Lake - The Backrooms

Level 4, Enter The Backrooms Wiki

Level 4, Backrooms: Interdimensional Adventure Reborn Wiki

Sublevel 1.5, Backrooms Unlimited Wiki

Level 1 SUB LEVELS, Enter The Backrooms Wiki