Reversed Factorial: factorial 19*3 in hexadecimal has 64 characters, reverse it.
Hidden Chess (x2): Kavalanche chess game: 32 moves, two seeds.
One seed for white's moves: replace G by 0 and H by 9 (the only missing numbers in chess notation) and add 1 if there is a check.
Black seed has each move spelt backwards.
Color Hex Codes: Take each pixel color in hexadecimal, get a 64 hex seed.
+19 sequence: 19+19=38, keeping adding 19 eventually gives 437, concatenating all results has length 64.
Genesis Public Key: The Creation of Adam (BANANO style) hints at the genesis. The 'source' of the first block is the seed.
Monkey Talks: The logo hints that the first part of the seed in on MonkeyTalks
hex(index) + F" 23 words, last two are not valid. It's not a mnemonic, taking the BIP39 word indices in hex gives 3*21= 63 hex characters. Pay Respects = press 'F'
#la-jungla: 24 mnemonic words in spanish
hex(19^60): The seed is the hexadecimal value of 19 to the power of x, where x is the value that gives 64 characters.
page.zip: The image of a zip folder hints at a zip file: change the html extension. Hover the image with the mouse to see the image title is '2+2'. The zip passwor is thus 'benis'
PDF Barcode: Scan this PDF417 barcode to get the seed
Hexadoku diagonal: Solve the hexadoku, to extract the right 64 chars, choose the aesthetically pleasing diagonal mae by 4x4 blocks
Discord Discriminators: Those are Discord names, taking the four digit discord #dicriminator give the 64 hex seed
Flipped page.txt: The icon for a text file is upside down, reverse the html filename and use the .txt extension. The file comtains upside down BIP39 words.
YouTube Reply: Find the YouTube video by ziz, the last answer to the first comment is a mnemonic
π: 64 digits of Pi
Second Draft QR: Change the '19-17-1-copy.png' filename to get the other image
Sorted Lengths: Sort the number by length to get the right order