SkyCorp Global

is creating Transformative Technologies

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- Vote on upcoming features / polls.

- Optionally receive an e-mail when new versions are released (if you have your Patreon settings set up for post notifications).

- Access to 'Research Patron' Discord role & 'Research Lab' private chat room.

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Full Game Access Pass

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This provides full access to Private 'Full Game' Builds, which contain exclusive story chapters (over a novel's worth!) and features that will never be available in the public demo build.

You will be able to play new, updated builds with the latest content as long as you keep your subscription active. You may also cancel easily anytime, but will lose access to the game until you subscribe again.

Includes Discord benefits

Full Game + Credit

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Includes the Access Pass from the $10 tier, and also an optional in-game credit!
Includes Discord benefits




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About SkyCorp Global

Please note that game access for Patreon backers is not granted (or charged) instantly. 

Your pledge will not be billed or take effect until the first few days of the following month. The exact timeframe depends on Patreon's processing time, but you can expect access granted within the first few days of the next calendar month (ie: if you pledge anytime during January, access would be granted sometime between Feb 1 and Feb 5).  Please see the 'Becoming a Patron' section below for more information, game download location and alternate payment options if instant access is required.

If you need instant access, please back us through BMT (our other authorized retailer) via our website.

The Story...

In 2019, a virus was discovered that caused extensive mutagenic effects in the general population.

SkyCorp Global’s Research Division was the first to identify this virus, designating it VIR-819. The infection was pronounced and forever changed anyone it touched. Victims often underwent significant changes to their libido, frequently becoming sex-crazed. These glandular changes sometimes caused dramatic shifts in patient’s height, weight, even their gender. In the most extreme cases, the infected lost their very humanity itself as they devolved into monstrous animal-human hybrid creatures. It was clear that dramatic steps needed to be taken to protect our way of life.

This contagion spread like few ever had previously. With no cure in sight, the following year SkyCorp was awarded the Department of Defense contract to create a quarantine zone for the infected. The quarantine zone was hastily constructed, and with close partnership from the National Guard, all infected were forcibly relocated. To this day, SkyCorp continues the administration of the quarantine zone.

Due to this zone being a collection of largely underground facilities that were reappropriated for containment, the project has been colloquially referred to as ‘The Underworld.’ While uninfected citizens are technically permitted to visit The Underworld, it is heavily discouraged due to the risk of exposure. Still, occasionally a citizen will need to enter regardless. In that situation, we can only pray they will return human — or they’ll become a permanent resident themselves.

What is it?

The Underworld is a text based transformation game for mature audiences including erotic content such as: furry transformation, monstergirl transformation, gender transformation, oviposition, lactation, and much more.

Along the way, you’ll meet a wide cast of characters across the three factions that each have their own ideology about how to deal with people different from themselves. Your actions will determine which faction achieves victory, and by extension, the fate of humans and hybrids alike.

The game is a work in progress.


“I love this game so far! If I had two sentences to review this game and encourage others to give it a shot, it would be these two: I used to be quite disinterested in slug girls.
I am now utterly and wholly interested in slug girls.” — Railby

“This game has truly been an enjoyable play through, the story is enjoyable, game itself is cross-platform because of flash, and the current variety of scenes and what can be done is really enjoyable.”

“10/10, would hook up with crazy dragon lady again.” —

Get a Build

There are three different types of builds of The Underworld you can play:  Demo (Public), Full Game (Private), and Dev (WIP).

What is the Demo (Public Builds)?

Public builds can be downloaded for free from the Research Materials page.  You could consider it a demo of the full game.  You can play through the first three chapters of the game.  It is also occasionally updated with non-story content as well.

It is a good idea to try this before becoming a patron to see if you like this sort of game.

What is Full Game Access (Private)?

The full version of the game is available exclusively to individuals who support the game's development financially.  Sometimes referred to as 'private builds,' this is the full version of the game with tons of story content and features that will never be available in the demo.  These builds are considered to be stable and playable.

A whole novel's worth of additional content and story chapters is exclusive to the full game, with more being written.  Additionally, the full game includes robust modding features to add your own enemies, items, transformations, and clothing.

You will have access to play the game so long as you are a backer at this tier, including all full game content that's ready to play and (in future) DLC content.  You may download builds easily through the Researcher Intranet

What are Dev WIP Builds?

These are work-in-progress builds made in between private builds.  For instance, they might show a chapter with only the first part of the chapter content.  Saving may or may not be disabled for these builds, and they are not as well tested generally.  They will contain sections of untested content, limited/missing instructions, empty rooms, broken text, or halting bugs.  Also, I am not as fast at updating as other developers.

Becoming a Patron

Patronage works on a monthly cycle, and does not charge you until the first of the month.  All rewards are granted after your credit card has been successfully charged on the first of the month.  (Note depending on Patreon delays, the charge may happen 2~5 days into the month instead of being exactly on the first).

If you choose to cancel your patronage before this charge takes place, you will not be charged (ex: if you subscribed on Jan 25, but cancel Jan 27 before the Feb 1 billing cycle starts, you would not be billed).

If you need immediate access, buying through our BMT storefront via the Researcher Portal is set up to grant you automated access to private builds right now, however it does not support PayPal or AMEX.

Note it is not recommended to unpledge within the first few days of the month as this may cause the script to not see your pledge for that month.  I recommend waiting a few days and doing so after pledges for the month have been updated on the site.

Backing one reward tier will include the smaller reward tiers as well. 

Game Builds Download Location

Link your Patreon account to the Researcher Portal, all game builds will be delivered there after payment is charged (see above notes regarding delivery timeframe).

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