D.Y3: ◉youareprepared◉

On 09/29, at the date and time listed in D.E0, a new video was uploaded to the tenretni olleh channel (D.Y1). It consisted of a distorted Game Theory intro, followed by a message in English (“Hello Internet. Are you ready to take the first step? Good. Great. So are we.”), followed by a ciphertext message.

The opening features glitched hexadecimal text on the bottom of the screen at (0:06 and 0:08). The first hex text is 6a 75 6c 79 20 31 35 20 31 39 38 33 which decodes to july 15 1983. The second hex text is 74 68 65 20 66 69 72 73 74 20 31 which decodes to the first 1. 07/15/1983 was the release date of the Nintendo Famicom in Japan, the "first" Nintendo game system.

The distorted Game Theory intro also features a binary code (at 0:13) on the bricks as Mario runs across the screen. Using a key (at 0:14) saying that red is one and black is zero, it decodes to https://www.thetheoristgateway.com/notthefirst18fc17.html.

This lead is further explored in (D.E1).

The five English sentences are written in different colours: green, blue, yellow, purple (fade to green), and green.

The final ciphertext message has been decoded as a simple substitution cipher. The text readsFIND THE SEARCH - READ THE NOTES - FEAR RABBITS THAT VENTURE INTO HOLES - THE GATES SHALL SUMMON YOU - PATIENCE - AND KNOW THIS - YOUAREPREPAREDThe "search" probably refers to the word search (D.E1) and the notes to the notebook (D.E2). Gates are also referred to in the notebook, and rabbit holes are a common ARG term.

For recording purposes, at the beginning of the intro, when the symbols on the logo flash, they repeat a lot. The sequence is as follows (A = all, TL = top left, etc.): TL, BL, BR, TR, A, BR, TR, A, TL, BL, A, A, A, A.

A spectrogram of the video has revealed a key for the cipher with a full alphabet and numeric system. The spectrogram shows the alphabet, two dots, then the numbers 0-9, then another two dots, then mathematical equations which can be used to deduce the meanings of operators. This cipher is later used in D.E1.

The spectrogram also shows text "the one replaced", which probably indicates how to decipher D.E1.