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I don't know how everyone found this but a Youtube Channel named (tenretni olleh) which is (Hello Internet) spelled backwards was found before September 29th 2018. It was probably a clue I missed in the (What Is MatPat HIDING?) video.

The new (https://wiki.gamedetectives.net/index.php?title=Game_Theory_ARG) Wiki says it was a suspicious looking tag that may appear within the video description, titled #UCVNTZJXAuvE3C7SfOsPNgEA this was found to be a YouTube channel ID.

I personally can't find it there anymore so my guess is that its also hidden on the (www.thetheoristgateway.com) and in the (What Is MatPat HIDING?) video. If you know more about this please add it as new note Thanks! BTW make sure you check out TheGameDetectives Wiki there doing a great job Archiving all of this.

The Channel Icon is a upside down Red Game Theory Logo with red hidden text and a black banner that says (Patience Is Key) in green text.

On September 29th 2018 the date from The Letter a 1 minute video named (◉youareprepared◉) was posted on (tenretni olleh) and the black banners green text was changed to (Hello Theorists, Have You Come To Play?) also (thetheoristgateway.com) was updated with a broken count down.

The video is a glitch out Game Theory Intro with clues hidden in side.

First we have 2 Hex Codes one at 0:06 (65 75 6c 79 20 31 35 20 31 39 38 33) and the second one at 0:08 (74 68 65 20 66 69 72 73 74 20 31)

When translating the first we get (July 15 1983)

And when translating the second one we get (The First 1)

At 0:13: Theres a hidden Binary message under Mario when translated we get a link to (https://www.thetheoristgateway.com/notthefirst18fc17.html) When you go there it shows another web link with one of the directory's being a spinning Red Game Theory Icon which is hinting to the (tenretni olleh) Youtube Channel Profile Pic that has hidden text (pow zNb Xdd MnH) Or when turning it upside down you get (HuW ppX qNz mob) When using both of these we get two new URLS (https://www.thetheoristgateway.com/3932396663/powzNbXddMnH.html) and (https://www.thetheoristgateway.com/3932396663/HuWppXqNzmod.html) I will go in more detail about these URLS later in a new Note.

Also when the video is slowed down instead of the moon MatPat's face appears for a split second on 0:16

I also noticed the Koopa from Mario was changed to Link from the Legend of Zelda

Also at 0:18 each time when the text comes up on screen its different colours in this order (Green, Blue, Yellow, Purple, Green) Maybe its useful some time later in the ARG?

At the very end we get a Secret Message ridden in custom symbols if you didn't know its a CryptoGraph and the Cipher for it is visually in the audio its a Spectrograph to see it you must put it in a Spectrograph viewer like Audacity or Sonic Visualizer by doing this you will see the custom Alphabet.

There are 26 letters in the English alphabet but there are more then 26 symbols in the spectrograph the community believes the extra symbols have other means for latter in the ARG or maybe in a new ARG?

When these symbols are translated they say the fallowing text.

(Find The Search. Read The Notes. Fear Rabbits That Venture Into Holes. The Gates Shall Summon You. .Patience. And Know This. .YouArePrepared.)

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On September 17th 2018 MATPAT posts on youtube and on
(thetheoristgateway.com)
A image of a thank you message for playing his first beta ARG and welcomes us to the new ARG.

"QUOTE The Game Theorists Between what's hidden here and what was hidden in yesterday's episode, you should have where you'll find the next clue and the day and time it'll appear. Good luck... QUOTE The Game Theorists"

The text in The image has typos these are Hex numbers (524742323534) and when decrypted it says "RGB254" which is the colours needed to unhid a date and time stamp in the image.

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(FACT) MATPAT Gives Us Are First Set Of Clues

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(FACT) MATPAT Gives Us Are First Set Of Clues

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On September 16th 2018 MATPAT posts a video on the Game Theory Youtube Channel Titled (What is MatPat HIDING?) In this video MATPAT hides many Clues and Decoys for the ARG.

The first one at 0:07 is a encrypted message (Uifsf op Fbtufs Fight jo ifs. Hp bxbz.) When decrypted with a ROT25 cipher we get the message (There are no Easter Eggs in here. Go away.)

The next set of clues are found in the Captions if you had the captions on while watching you might of noticed they were customised.

First at a 1:10 (minD bLoWn)

And at 8:29 We get some morse code.
(See Image Below For Morse Code)

When translated it says (It begins again today. Find the clue in this video and get me in the place at the time)

There's also some numbers at 8:50 (2433 3526 2190)

I don't know if these are useful or not but I decided to add them just in case.

"NOTES"
There might be more clues in the video that I missed if so feel free to add to this list or fix any errors you see Thanks.
"NOTES"