One bloody night is a nine level PWAD for Doom II: Hell on Earth. It was released on June 27, 2002 by Erik Alm and Fredrik Johansson. It contains new music for the new levels (with the exception of level eight which uses Doom II music).
The text file states that each map took one to six hours to finish and that the entire project took thirty to forty hours to complete. Erik Alm designed the levels and Fredrik Johansson designed the sky. Some of the levels were originally going to be included in a megawad, but were instead included in One Bloody Night due to the megawad never being finished.