This content requires the base game Horny Asylum on Steam in order to play.

Release Date:
Oct 25, 2026
Developer:
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Downloadable Content

This content requires the base game Horny Asylum on Steam in order to play.

Buy Horny Asylum : The Undercroft

 

Mature Content Description

The developers describe the content like this:

This DLC contains frequent, explicit, uncensored sexual content that is central to it and cannot be disabled. Sexual acts depicted include handjobs, oral sex and vaginal sex (including from behind), female masturbation and visible ejaculation, inside or outside, as well as full nudity. Pairings are male/female.

The setting is a horror-themed asylum basement with jump scares. There is no violence or gore.

All sexual encounters are consensual: characters willingly initiate and participate in every scene.

All characters are fictional, and all characters depicted in sexual situations are adults aged 21 years or older.

About This Content

SHIFT DEBRIEF: Undercroft post, night guard. Shift: 12 AM to 6 AM. Status: survived, mostly.

The Undercroft is a new night-survival mode for Horny Asylum. They moved me downstairs. Under the asylum there are flooded cells, a sewer, and one guard booth with a wall of old TVs. My job is to sit in it until 6 AM and keep the inmates out. Nobody mentioned the inmates.

THE POSTING


Four inmates on my block: Chloe, Gwen, Lola and Eve. Three of them sleep in the cell block. Around the second hour they wake up, sit up, stand up and start walking. Eve doesn't have a bed. Eve doesn't sleep. Eve comes straight for a door.

EQUIPMENT

The TVs hanging over the desk are my cameras: Cell Block, Left, Middle and Right Corridor, Sewer Junction, and one labelled Behind You. Somebody thought that was funny. If an inmate shows up in a corridor, she's heading for that door. If she shows up at the junction, she's coming up behind me.

In front of me there are three cell doors. Click a doorway and it slams shut. Behind me there's a floor trap and a pipe. When a head comes up out of either one, you slam it. Fast.

KNOWN ISSUES

Every door I close drains the battery. To recharge I have to open everything: every door, the trap and the pipe. While it charges the cameras show static. I've raised this with management. Management is upstairs.

INCIDENTS


I've got three strikes a night (the game shows them as hearts). When one of them gets in, she runs right up to my chair and doesn't leave until she's done with me. Hands, mouth, or she climbs on and rides me right there at the desk. Then she goes back to her cell and I go back to work, one strike down.

They also dress differently every night. Night 1 it's sweaters and mesh tops. By Night 3 Gwen shows up as a blindfolded maid and Lola in black latex. By Night 4 nobody's bothering with clothes. HR has not responded to my email.

END OF SHIFT


If I make it to 6 AM, the night's mine and I get to pick which inmate I take back with me. She walks into the booth naked and I take her from behind on a cell-block bed. Final decision of the shift: cum inside or cum outside. I'm told this counts as overtime.

ROTA

  • Night 1, Sewer Gate: Easy.
  • Night 2, Pump Station: Normal.
  • Night 3, Hydrotherapy: Hard.
  • Night 4, The Pit: Nightmare. They get faster every hour.
The Undercroft opens from its own button on the Horny Asylum title screen. Clear all four nights and the post is yours.

Recommendation for the next guard: keep the doors shut. Or don't. Your call.

AI Generated Content Disclosure

The developers describe how their game uses AI Generated Content like this:

Artificial intelligence was used for parts of the game's localisation and to generate the narrator voice in this DLC's trailer.
In-game visuals were using AI.

Nothing is generated live during gameplay.

System Requirements

    Minimum:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 (64-bit)
    • Processor: Dual-core 2.0 GHz
    • Memory: 4 GB RAM
    • Graphics: H.264 (Intel HD 4000 / equivalent+)
    • DirectX: Version 11
    • Storage: 1250 MB available space
    Recommended:
    • Requires a 64-bit processor and operating system
    • OS: Windows 10 or 11 (64-bit)
    • Processor: Quad-core 3.0 GHz
    • Memory: 8 GB RAM
    • Graphics: GTX 1050 / RX 560 / Intel UHD 620+
    • DirectX: Version 11
    • Storage: 1250 MB available space