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The interactive Netflix Black Mirror episode Bandersnatch has many points where the user has to choose the path the story will take.

Some of these choices make little difference to the overall path but still require different versions of the following scene to be shot. Others create extra complexity in the future by modifying future choices. Some seem to allow a very large number of viewer choices (one scene involves choosing a multi-digit (5 or 6 digits?) phone number which implies a very large number of choices and scenes to be shot.)

The combinations seem to create a large space of possible events with many possible outcomes. This implies a large number of scenes needed to be shot even if we ignore the choices where little is changed by the choice.

So, how much footage is there? How many possible paths exist? Will we ever find them all?

"So, how much footage is there? How many possible paths exist? Will we ever find them all?"

"I don’t know how many endings there actually are — I think I’ve
forgotten,” Brooker, the creator and writer of the Emmy-winning
series, tells The Hollywood Reporter. When his producing partner,
Annabel Jones, suggests to THR there are five “definitive” ends,
Brooker interrupts: “No. There are more than that.”...

Even Netflix says that while there are five “main” endings, there are
multiple variants on each that they are daring viewers to uncover. And
Brooker and Jones are clear as to not “prescribe” one ending over the
others, especially because they couldn’t agree on what exactly defines
one.

This seems exceedingly hard to determine since everyone who worked on the project doesn't seem to agree or even know! Creator & writer Charles Brooker and Netflix claim there are about 5 definite endings, but producer Russell McLean says there are 10-12 endings, because some are less definite. Director David Slade mentions that we may never see every ending, because there are "golden eggs" that seemingly have yet to be "unlocked"

If you ask producer Russell McLean, there are 10 to 12 endings because
some are less definitive. And director David Slade says there are even
“golden eggs” that are so difficult to reach, they may never be
unlocked. “There are scenes that some people just will never see and
we had to make sure that we were OK with that. We actually shot a
scene that we can’t access,” Slade said when the team introduced the
episode to a group of reporters, including THR's, at Netflix’s
headquarters in Los Gatos, California.

But in terms of actual footage shot, there is seemingly 150 minutes of "unique footage" divided into 250 segments. Some stories are as short as 40 minutes, while the average run time is 90 minutes, however at least one story goes for 2 and half hours!

Bandersantch is presented as an interactive film. A brief tutorial,
specific to the device being streamed on, explains to the viewer how
to make choices. They have ten seconds to make choices, or a default
decision is made. Once a playthrough ends, the viewer is given an
option of going back and making a different choice. The average
viewing is 90 minutes, though the quickest path ends after 40 minutes,
and at least one path results in a 2.5-hour viewing experience.
There are 150 minutes of unique footage divided into 250 segments.
IGN reports that according to Netflix, there are five "main" endings,
with variants within each ending; such endings may be intercut with
credits, similar to other Black Mirror episodes. Producer
Russell McLean said there are between ten and twelve endings, some of
which are more vague as endings compared to others, and according to
director David Slade, there are a few "golden eggs" endings that may
take a long time before viewers figure out how to achieve them. No
ending is considered "prescribed" over any other, according to
executive producers Charlie Brooker and Annabel Jones, particularly as
they felt some endings were not truly endings in the traditional
sense.

The makers decline to offer specifics:

If you ask producer Russell McLean, there are 10 to 12 endings because
some are less definitive. And director David Slade says there are even
“golden eggs” that are so difficult to reach, they may never be
unlocked. “There are scenes that some people just will never see and
we had to make sure that we were OK with that. We actually shot a
scene that we can’t access,” Slade said when the team introduced the
episode to a group of reporters, including THR's, at Netflix’s
headquarters in Los Gatos, California.

Even Netflix says that while there are five “main” endings, there are
multiple variants on each that they are daring viewers to uncover. And
Brooker and Jones are clear as to not “prescribe” one ending over the
others, especially because they couldn’t agree on what exactly defines
one.

“There were quite heated debates about what constitutes an 'ending,'”
says Brooker. “There’s a school of thought that says any time it stops
and you go back, that’s an ending. In Bandersnatch, there are endings
that are really abrupt that are still endings, in my mind.”

Besides, Jones points out: “In a world of parallel realities, maybe
there is no ending?”

iO9 adds:

While this might be frustrating, it doesn’t seem surprising. The
episode reportedly has about five hours of prepared footage. I played
through the entire thing, including all of these endings, to the best
of my ability and capped out around four hours. There are several
places where other Easter eggs could come into the picture, like with
Stefan’s dad’s locked box, or the phone number used to call the
therapist. Plus, some fan sleuths have pointed out behind the scenes
footage that could point to other scenes we haven’t even seen yet.

And for anyone looking to have all the answers handed to them at some
point, I’ve got some bad news: Showrunner Charlie Brooker confirmed to
THR that they will not be releasing a linear version of Black Mirror:
Bandersnatch. What we see now is all we’re going to get.