<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