MARDEK
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Useful wiki pages & local files
By somebodybond
Links to the most useful wiki pages & how to access useful information included in the game download & DLC
   
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Intro
The walkthrough included in the game is quite handy, but sometimes you want more spoiler-y and specific info. For folks new to the game, or old veterans returning after a while, I thought it'd be helpful to provide a link to the Figverse wiki, which has a great deal of information, and highlight some of its most useful pages. I also included a bit about the useful files provided by the dev in the game download itself & how to find them, as well as a description of the DLC files and how to find those.
Links
Wiki's main MARDEK page: https://figverse.fandom.com/wiki/MARDEK_(Series)

Completionist guide: https://figverse.fandom.com/wiki/Completionist_Guide_(MARDEK) - a detailed guide on what you need to do in order to get every item, unlock every encyclopedia entry, and so on.

Missable Items guide: https://figverse.fandom.com/wiki/Missable_Content_(MARDEK) - a list of all content which can be permanently missed.

List of medals: https://figverse.fandom.com/wiki/Medals_(MARDEK) - a list of the different medals (~achievements) available in chapter 3 and how to get them.

Main Skills page: https://figverse.fandom.com/wiki/Skills_(MARDEK) - from here, you can select a character's skillset, or physical/magical reaction skills or passive skills, to see all the available skills in that skillset, which characters can learn each skill, and what items grant those skills.
In-game Help
There's an in-game help section for info on basic controls and such. To access it, when you aren't in a conversation, battle, or cutscene, press Enter to open the menu, use the up/down arrow keys to navigate to the Help listing on the bottom of the menu on the right, and use the left/right arrow keys to scroll through the pages.
Local game files
A walkthrough, written by the game's developer, is included in the game's download; you can find it in the game's local files as "Walkthrough.exe". (Yes, it's a .exe, not a .pdf or the like; originally it was uploaded to at least one flash game site alongside the games themselves, so presumably it was easier to just port that over rather than convert it to a document.)

There's also a document named "Changes from the Original.txt," which is exactly what it says, for returning players who want to know what's different in this version. If you're doing a completionist run, it's worth glancing over that, since the wiki might not include those changes in its guides.

These files, as well as the other game files & saves, can be found by right-clicking the game in your Steam Library, opening the Manage menu, and clicking "Browse local files". Or you can navigate to the game's file location directly, by finding your Steam or SteamLibrary folder and clicking steamapps, then common, then MARDEK.
OST & Extras DLC
The optional DLC includes an 81 page pdf with notes on the storyline, the original soundtrack (as .mp3 files), piano recordings of select tracks (also as .mp3 files), and .pdf sheet music for those piano arrangements.

The easiest way to find these files is to go to the MARDEK page in your Steam library, click the DLC listing on the right, and click "Browse local files" on the left; it'll open an Explorer window. Or you can navigate there manually by going to your Steam or SteamLibrary folder, clicking steamapps, then music, then MARDEK - OST & Extras.

Happy gaming!