This Backrooms level is based on a photo of a real place, which just happens to be the Holiday Inn hotel at Terminal 4, London Heathrow airport! This odd shaped, enclosed courtyard with the claustrophobic roof, flanked on all sides by window, has become infamously known as Level 188 of The Backrooms!
The only known way of exiting Level 188 is via one the windows present in the walls, but be warned, this level is a Class 5 survival difficulty, (the most dangerous), with many window’s actually being Window entities. The only safe way to exit Level 188 is through the same window you entered from.