<sup> (This is the last of a series of puzzles written for [Timwi](https://puzzling.stackexchange.com/users/1480/timwi?tab=profile) for a Secret Santa puzzle exchange, themed around various custom modules for the game *Keep Talking and Nobody Explodes*. **Note: Unlike previous puzzles in this series, KTaNE knowledge is necessary to solve this puzzle; the necessary knowledge can be found on [Timwi's site](http://ktane.timwi.de).**)</sup>

---
# On The Subject of ???

To solve this last puzzle, I have a suggestion:  
Just add these few glyphs to the guide page in question.  
Take new digit tetrads, use each on the next  
to resolve the conundrum you see in this text:  

*The principles, truths that have been recompiled*  
*that Timwi has indexed and sorted and filed*  
*will help you defuse any bombs in this game:*  
*for these all as one, **what might be an apt name?***

[![pixel art with arrows][1]][1]

$$\begin{array}{|c|c|c|c|}
\hline
{\text{S.E.T.}} &  {\text{Discolored Squares}} & {\text{Black Holes}} & {\text{X-Rays}} \\
\hline
{\text{Colored Switches}} & {\text{Bitmaps}} & {\text{Word Searches}} & {\text{Marble Tumble}} \\
\hline
{\text{Odd One Out}} & {\text{Binary Puzzle}} & {\text{Dr. Doctor}} & {\text{A Souvenir}} \\
\hline
{\text{Battleships}} & {\text{Blind Alleys}} & {\text{Rubik's Cube}} & {\text{Regular Crazy Talk}} \\ \hline
\end{array}$$

---

<sup>This is a metapuzzle using the following puzzles:  
[S.E.T.](https://puzzling.stackexchange.com/questions/93134/on-the-subject-of-s-e-t); [Discolored Squares](https://puzzling.stackexchange.com/questions/93161/on-the-subject-of-discolored-squares); [Black Holes](https://puzzling.stackexchange.com/questions/93198/on-the-subject-of-black-holes); [X-Rays](https://puzzling.stackexchange.com/questions/93218/on-the-subject-of-x-rays)                          
[Colored Switches](https://puzzling.stackexchange.com/questions/93241/on-the-subject-of-colored-switches); [Bitmaps](https://puzzling.stackexchange.com/questions/93263/on-the-subject-of-bitmaps); [Word Searches](https://puzzling.stackexchange.com/questions/93322/on-the-subject-of-word-searches); [Marble Tumble](https://puzzling.stackexchange.com/questions/93356/on-the-subject-of-marble-tumble)            
[Odd One Out](https://puzzling.stackexchange.com/questions/93392/on-the-subject-of-the-odd-one-out); [Binary Puzzle](https://puzzling.stackexchange.com/questions/93512/on-the-subject-of-binary-puzzle); [Dr. Doctor](https://puzzling.stackexchange.com/questions/93518/on-the-subject-of-dr-doctor); [A Souvenir](https://puzzling.stackexchange.com/questions/93540/on-the-subject-of-a-souvenir)                  
[Battleships](https://puzzling.stackexchange.com/questions/93607/on-the-subject-of-battleships); [Blind Alleys](https://puzzling.stackexchange.com/questions/93682/on-the-subject-of-blind-alleys); [Rubik's Cube](https://puzzling.stackexchange.com/questions/93706/on-the-subject-of-rubiks-cube); [Regular Crazy Talk](https://puzzling.stackexchange.com/questions/93836/on-the-subject-of-regular-crazy-talk)</sup>

<sup>For convenience's sake, here are the answers to the above puzzles:</sup>
>! MATTRESS, RHOMBUS, EYEBRIGHT, IBEX  
>! SOCIETY, REGISTERED OWNER, BANANA, STARTER  
>! CHINESE LANTERN, LOGGED, ETHOS, EUPHORIA  
>! ELEFTHERIA I THANATOS, SHOVEL, ANDROID, YEAR


Hint:

>! Each of the previous puzzles was themed after a single module Timwi has made. This one is as well; it will be immediately clear which one is the right one when you find it.


  [1]: https://i.sstatic.net/CuHNM.png