yeah, that's what i figured, but i can't make out what those stacked symbols on the far right are. the bottom one looks like a roman numeral ii, but the top one on mine is kinda hard to see - my pages aren't perfectly aligned.
Also don't have the answer, but I was guessing based on the word "up" and the keys for 83 + 91 that the word written on the end of the book (looks like 15 and two roman numeral 2s?) is important. I think they are saying to bend the book to look at the edges.
Not much to say here. Just walk it through - the end condition is very apparent. If it helps, you can make a map of the options, but it isn't necessary.
ugh, that video. 22 minutes of near nothing. I tried skipping around and only found 6 of them, so I guess I'll need to actually sit through it (maybe at 2x speed) unless somebody found a better way.