Filmanui landed "Multiverse" and was also required to include either a bird's eye or worm's eye shot.
The film needed a whisper, a gatekeeper and a sign, with the last two "open to interpretation", Müller said.
It had to be made between 7pm on August 12 and 7pm on August 14, with a minimum length of one minute and a maximum of five minutes.
After brainstorming for half an hour, Müller spent the next two writing a script.
"We met at Russell's flat in downtown Whanganui the next morning and got straight into it," Müller said.
"He has a cat and unfortunately a couple of us were allergic. The film was made to look like it was night time so we had to board up the windows and black everything out.
"Breathing was a bit of an issue. By the end of the day, it looked like people were going to keel over."
Penton was "on fire" throughout filming, Müller said.
Freddie Müller films his twin daughters with the help of videographer Michael Weatherall. Photo / Supplied
The project was a family affair, with Müller's identical twin daughters making an appearance in the film and his wife organising props.