This is a comprehensive and complete roundup of the answers submitted by various users and brought together by the OP. A lot of this was solved in chat, mainly by Deusovi, Rubio, Techidiot and Volatility.
The answer to this is
Each algebraic equation:
Doing this for every equation gives:
Transcribed this is
If we use
As per @Henkie's post, the second door from EXAMPLE ROOM solved
GET TWO FREE solved
MAZES IN MAZES solved
HALF THE PICTURE solved
MIND GAMES solved
WHERE ARE YOU? solved
ILL OMENS solved
GOAL IN SIGHT solved
BLOCK CIPHER solved
When the QR code is decrypted, we are given NGnc7. As @LeppyR64 figured out, this is an Imgur address, which leads us to this image:
Open this image with a text editor and you will find the bitcoin address at the end (see here for an image):
Running a blockchain search for this address gives us :
And that address belongs to...
Which when applied on the meaning less letters gives -
Lets try solving the algebraic equations -
With the help of @Rubio and @Deusovi it seems like a pattern stating (Paragraph Number-Letter+Number of characters to move towards Direction(E,W,N,S)
Applying this on the image of the page we get
Hence the sequence we get is -
The first stage leads us fairly clearly to
And here are the clues in total
this leads us to
The spoiler text is
This brings us to
The title of which is
While the text decodes to
All credit to everything going on here
I noticed few things:
Thanks to @Techidiot: I've already guessed the correct solution, but he gave me the right way to approach the answer.
7th:thanks @Sid for the tip:
That was so much fun, thanks @Techidiot for the puzzle I learned a ...
Final Complete Answer:
The original image QR gives:
Clicking on the image and reading the QR there gives
Notably it's upside down
The barcode on the cereal says:
And the QR says:
The barcode on the side gives
a link to here
The QR there says:
The barcode there says:
there is also a hidden imgur address
which leads to:
The solution to the ...
(OP Edit: This answer solves the final (and crucial) part of the puzzle. For a complete answer, please see BeastyGerbil's answer, which includes the works of BeastlyGerbil, olesaw, MOehm and Xenocacia.)
I feel bad posting this as an answer when other people have done so much of the work, and I'm missing some of the details, but I believe the answer to the ...
Clicking on the picture gives an image with the text
The answer must be 5 letters. It is
Which using the conversion table gives
@oleslaw got it. It is
@oleslaw got this too, it is
The answer (from @MOehm) is
The answer from @MOehm is
So we must look at the signs we've seen through our ...
The person who emailed you is trying to tell you
Your mind wanders back to the effort they put into hiding this message...
Clicking on the image you found a picture of a bookcase and a computer. The bookcase contained links which led to other images. A lot were filler images, but there were a few that caught your eye...
The trickiest to find
(Don't worry, I haven't been spoiled for this! I just know the final passcode and that's it.)
After a few story images, we get to this:
Now we have a branch!
That final image contains a code using the same method as the other codes we've seen so far. That code decodes to the password:
Solution of mazes 2 and 3
Sounds like you guys need some programming duty! Thanks in huge part to @Anton's huge help in organizing all the paths in a friendly format, I was able to quickly cook a Python script that goes through all possibilities:
BASE62 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
Wrap-up: The Making Of This is it. This is the One. Save your wife
This is not a solution to the puzzle, but provides notes from its poser. This type of answer has been approved by the community.
Caution: This post may contain spoilers.
For a similar post, see the wrap-up on the first of the series - This is it. This is the one. Find your wife.
Community Wiki from OP with complete answer:
By clicking on the image we get
To get the next image
If part of the image is higher up then it represents capitalization.
Sign language for
which is the final image
The answer is
which is hidden
Partial answer (part 1)
Thanks to @GentlePurpleRain and @El-Guest for decoding.
The answers to the decoded riddle are:
These characters (after trial and error with capitalization) point to the following image:
Partial answer (part 2)
Improving on @practiced_liar's findings,
For convenience, I wrote myself a sloppy but functional script to fetch ...
Using the imgur link @maxathaousand provided and the partial answer by @brian, the image gave me:
With the hint, I tried all cases until I got:
With the image:
Partial Answer Part 4.
Using hint 4, we see:
The typos in the text lead us to:
Final Answer Part 5.
Using the hint provided: