I have long been haunted by the thought "what if there's further secrets hidden in fields/dungeons in IMOQ?" However, I quickly realized that trying to determine this would be an utterly futile endeavor.



While working on the //INFO wiki, I tabulated the amount of combinations for the keywords found in the Games Tetralogy and wanted to share my findings here.

**Method:** (Keyword A) x (Keyword B) x (Keyword C) = Possible Combinations. Then multiply by how many servers are accessible per game.

I've included images of the Parts A, B, and C keywords in all languages for reference, as well as the breakdown for how frequently keywords are used for mandatory and optional events in the games, and the relevant server distribution.

You can learn more on the //INFO wiki. Here are the relevant articles:

* [Keywords (Games Tetralogy)](https://dothack.info/index.php?title=Keywords_(Games_Tetralogy))
* [Hidden Keywords (Games Tetralogy)](https://dothack.info/index.php?title=Hidden_Keywords_(Games_Tetralogy))
* [Liminality DVD Easter Eggs](https://dothack.info/index.php?title=Liminality_DVD_Easter_Eggs#Volume_1)
* [Keywords (Infection)](https://dothack.info/index.php?title=Keywords_(Infection))
* [Hidden Keywords (Infection)](https://dothack.info/index.php?title=Hidden_Keywords_(Infection))
* [Keywords (Mutation)](https://dothack.info/index.php?title=Keywords_(Mutation))
* [Hidden Keywords (Mutation)](https://dothack.info/index.php?title=Hidden_Keywords_(Mutation))
* [Keywords (Outbreak)](https://dothack.info/index.php?title=Keywords_(Outbreak))
* [Hidden Keywords (Outbreak)](https://dothack.info/index.php?title=Hidden_Keywords_(Outbreak))
* [Keywords (Quarantine)](https://dothack.info/index.php?title=Keywords_(Quarantine))
* [Hidden Keywords (Quarantine)](https://dothack.info/index.php?title=Hidden_Keywords_(Quarantine))
* [Fields (Games Tetralogy)](https://dothack.info/index.php?title=Fields_(Games_Tetralogy))
* [Areas (Infection)](https://dothack.info/index.php?title=Areas_(Infection))
* [Dungeons (Games Tetralogy)](https://dothack.info/index.php?title=Dungeons_(Games_Tetralogy))

# Keyword Combinations by game:

**Vol. 1:**

By game end there are a total of 29 Part A Keywords, 28 Part B keywords, and 28 Part C keywords.

This means there are 22,736 possible keyword combinations for each server. As there are two accessible servers in this game (Δ and θ), there are 45,472 possible fields accessible in INFECTION.

**Vol. 2:**

By game end: adds 25 Part A Keywords, 25 Part B keywords, and 26 Part C keywords.

This brings the total to 54 Part A Keywords, 53 Part B keywords, and 54 Part C keywords. This means that each server has 154,548 possible keyword combinations. As there are three accessible servers in this game (Δ, Θ, and Λ), this means there are 463,644 possible fields accessible in MUTATION.

**Vol. 3:**

By game end: adds 22 Part A Keywords, 24 Part B keywords, and 26 Part C keywords.

This brings the total to 76 Part A Keywords, 77 Part B keywords, and 80 Part C keywords. This means that each server has 468,160 possible keyword combinations. As there are four accessible servers in this game (Δ, Θ, Λ, and Σ), this means there are 1,872,640 possible fields accessible in OUTBREAK.

**Vol. 4:**

By game end: adds 24 Part A Keywords, 26 Part B keywords, and 25 Part C keywords.

This brings the total to 100 Part A Keywords, 103 Part B keywords, and 105 Part C keywords. This means that each server has 1,081,500 possible keyword combinations. Considering there are five accessible servers (Δ, Θ, Λ, Σ, and Ω), this means there are 5,407,500 possible fields accessible in QUARANTINE.



# So that's how many areas?

Now, initially one might assume that we can take Volume 4's numbers and consider that the final total of possible keyword combos. 

However...

Some of the fields and/or dungeon layouts **change between volumes**. I believe this is because the algorithm for fields and dungeons changed throughout development, though I don't know specifics. 

It's fine if we document those changes based on the areas specified by in-game events...but attempting to determine field changes for all possible fields across all four volumes is a fool's errand. 

There's just **too many**. It'd take a gargantuan amount effort/time and organization across many, MANY people, and I don't think the community has enough people with both the interest *and* motivation to pursue that kind of project. (But maybe I'll be proven wrong someday, who knows.)

This also doesn't cover *.hack//frägment Online✕Offline*, which adds machine-wall dungeons and allows people to create their own fields. Maybe it'd be more feasible for just "offline mode," but still...It's absolutely intimidating to even consider for one game, let alone five. 

And who knows how many changes there may be between the Japanese, North American, PAL, and Korean localizations. Throw in the possibility of changes in the "PS2 the Best" versions...and it truly is intimidating to even consider.



# Keyword Frequency

As for the areas used for mandatory and optional events in the games, we can break down the frequency of how often keywords are used, and on which servers those areas are distributed.

Across the four volumes, a total of 111 areas are used in story events, optional events, and hidden keywords.



|Symbol|Server|\#|
|:-|:-|:-|
|Δ|Delta|23|
|Θ|Theta|11|
|Λ|Lambda|25|
|Σ|Sigma|36|
|Ω|Omega|16|

Most of the areas used in the in-game events are on the Sigma server. 

"Detestable" (Part A) is the most frequently used keyword, at 16 times across the games. This is because it's used for the all of the Goblin event fields.

After that, the most frequent words are:

* (Part A) Pulsating – 5
* (Part A) Collapsed, Dying, Hideous  – 3 (tied)
* (Part B) Gambler's, Elusive  – 6 (tied)
* (Part B) Golden – 5
* (Part B) Oblivious – 4
* (Part B) Grieving, Worst, Hot-blooded, Someone's – 3 (tied)
* (Part C) Core, Sunny Demon – 4 (tied)
* (Part C) Holy Ground, Messenger, Scent, New Truth, Gate – 3 (tied)

While most other keywords are used 1-2 times, a surprisingly large amount of keywords never end up being used in specific event fields. 

This could possibly make a good starting point for investigating potentially undiscovered secrets in fields, but I still reckon that the undertaking is far too daunting. 

Games Tetralogy Keyword Combinations and Frequency