NOTE: Make sure you have solved all puzzles on card 1 before proceeding with these.
Clue 1
By this point you'll have used almost everything...
Clue 2
Except for one item. If you haven't solved your cards fully, stop here until you do so.
Solution
The password to the final video, decoded from card 5, is: "Anaconda."
Clue 3
Anything you haven't used yet from card 5? Maybe something that could relate to the Ouroboros?
Clue 1
One of the items you deciphered on the back of card 1 said 'header', right?
Clue 2
Have you looked at the header image? I mean, really looked at it?
Solution
Clicking the header will reveal a QRC hidden behind the profile picture. Scanning that will give the text: "Key 2 is Azure."
Clue 3
You can't see the whole thing unless you click it.
Clue 1
One of the items you deciphered on the back of card 1 said 'header', right?
Clue 2
Have you looked at the header image? I mean, really looked at it?
Solution
Clicking the header will reveal a QRC hidden behind the profile picture. Scanning that will give the text: "Key 2 is Azure."
Clue 3
You can't see the whole thing unless you click it.
Clue 1
One of the items you deciphered on the back of card 1 said 'header', right?
Clue 2
Have you looked at the header image? I mean, really looked at it?
Solution
Clicking the header will reveal a QRC hidden behind the profile picture. Scanning that will give the text: "Key 2 is Azure."
Clue 3
You can't see the whole thing unless you click it.
Clue 1
One of the bits on the back of card 1 translates to "Favorite quotes."
Clue 2
Have you found her favorite quotes in her Facebook info? They don't look like quotes to me...
Clue 4
Hmmm... Day, month, year... word?
Clue 3
They look like dates, only... with one extra set of numbers...
Solution
Using the modified Arnold cipher in her quotes to index, you can draw a single word out of each referenced quote. The result is: "The fourth key is Mercury."
Clue 1
In the video, it sounds like she wants you to contact her via email, better find that on her page.
Clue 2
You'll probably need to include a passphrase of some kind.
Clue 3
Hmm, she mentions that she loves animals a lot...
Clue 4
...and there are lots of animal pictures on her page.
Clue 5
Use your stamps.
Solution
Using the alphabet from your stamps (the one that assigns letters to certain animals) and then gathering all the pictures on Agatha's page that have animals in them in order, you will get the word: "Tattletale." Email that to Agatha using the email listed on her Facebook profile.
Clue 1
One of the bits on the back of card 1 translates to "Favorite quotes."
Clue 2
Have you found her favorite quotes in her Facebook info? They don't look like quotes to me...
Clue 4
Hmmm... Day, month, year... word?
Clue 3
They look like dates, only... with one extra set of numbers...
Solution
Using the modified Arnold cipher in her quotes to index, you can draw a single word out of each referenced quote. The result is: "The fourth key is Mercury."