Black Mirror: Bandersnatch, HTML5 interactive version (original)
You have to download two json files -
bandersnatch.json
and
SegmentMap.json,
add first lines
(bandersnatch=
and SegmentMap=
accordingly), save them as *.js (html can't access json content without a server) then open html file in the browser (everything should be in the same folder).
If you're experiencing problems with local setup I recommend hosted version (just open the page and drag video file there):