Mature Content Description

The developers describe the content like this:

This game contains the following mature content:

[Sexual Content]
- Female characters are captured and bound by tentacle monsters. These scenes carry strong sexual undertones and depict non-consensual situations as part of the narrative.
- Across multiple chapters, captured women are restrained by tentacles and have their strength and will gradually drained until they lose consciousness.
- Late in the story, a heroine appears fully merged with the tentacles (depicted as a "breeding nest") and severs that connection herself in a self-sacrificial scene.
- Characters are drawn in an anime art style wearing revealing outfits with emphasized figures. Implied/partial nudity is shown, but no genitalia are depicted.

[Violence]
- Fantasy combat using swords, bows, and magic. Blood and gore are minimal.

[Other]
- All characters depicted in sexual situations are adult women. The game contains no depictions of drug/alcohol abuse or self-harm.

About This Game

Note: The base game contains no explicit content. Fully explicit 18+ content is available separately as an optional DLC, "NULL DUN - 18+ Adult Content" (coming soon).

A Rescue a Hundred Years in the Making

The battle to save the captured begins.

A monstrous threat looms over the kingdom: the "tentacles."
Nesting deep underground, they snatch people away and vanish into the dark.
One by one, the dungeons across the land have fallen to the kingdom's finest.
But one remains unconquered—the "Void Dungeon," from which no challenger has ever returned.

—One hundred years ago
Tanya, the kingdom's mightiest warrior, was ordered to clear the Void Dungeon.
She swore to her childhood friend, the princess, that she would return. She never did.
Freya, the holy saint, defied her father the king to follow her dearest friend into the dungeon—and was never heard from again.

—The present day
Reen, a rookie warrior, joined the army to pay for the medicine her frail sister Elna so desperately needed.
One night, a massive tentacle drags her sister away. The direction it fled—the Void Dungeon.
Plunging in alone, Reen discovers an old diary.
"It has been several days since I followed Tanya into the dungeon—"
The heroes who vanished a century ago. And yet, nowhere does it say they "died."

What will become of her sister? Are the captured still alive?
The desperate struggle of one weak, untested warrior is about to begin.

Roguelike × Deck-Building × Dungeon Crawling

A true roguelike RPG that fuses turn-based dungeon crawling with card combat.
Ever-shifting layouts. Limited turns. The single card in your hand.
Every choice means life or death.

◆ Dungeon Crawling

• Procedurally generated dungeons that reshape themselves with every descent
  
• Slip past enemy sightlines or charge in head-on—the choice is yours
  
• Gather treasure and gold to strengthen your deck
  
• Each floor runs on a turn limit—balancing caution and boldness is the key

◆ Card Combat
Combine a diverse arsenal of cards and seize control of the battle.

• Cut down foes up close with "Slash" and "Whirlwind"
  
• Whittle them down safely from afar with "Short Shot" and "Long Shot"
  
• Dominate strategically with the magic of "Thunder" and "Divine Bind"
  
• Weather the worst with healing—"Heal" and "Herb"
  
• Stay nimble and adaptable with mobility cards "Haste" and "Swiftfoot"

◆ Deck Building

• Earn new cards each time you clear a floor
  
• Cull the cards you don't need and refine your deck
  
• Cards level up—the more you nurture them, the stronger they grow
  
• How you build your deck and spend your gold decides victory or defeat

A Cast of Distinct Heroes

Each chapter puts you in control of a different protagonist—the cards you unlock and the way you play transform completely.

Reen—A rookie warrior. Small of stature and raw in skill, yet she braves the Void to save her sister. The hero of the present day.
Tanya—The kingdom's mightiest warrior. A legendary hero ordered to conquer the Void a hundred years ago.
Freya—The legendary saint. Her gift for magic rivals Tanya's own. She followed her dearest friend into the dungeon.

Those Held Captive by the Tentacles

Deep within the dungeon, a fate beyond resistance awaits the women caught in the tentacles' grasp.
Those held too long become "seedbeds," their bodies offered up as a living source of energy for the tentacles.
Reen, Tanya, Freya, and her sister Elna—their fates rest on how you fight.
(This game contains mature themes and sexual situations, but no explicit content. Fully explicit 18+ content is available separately as an optional DLC, "NULL DUN - 18+ Adult Content" (coming soon). Please see the "Mature Content Description" for details.)

Steam Workshop Support — Endless Dungeons

This title fully supports Steam Workshop. No matter how much you play, the dungeons never run dry.

• Create—Combine original cards and settings to build dungeons all your own
  
• Share—Publish your dungeons to the Workshop and reach players worldwide with a single click
  
• Play Endlessly—Subscribe to other players' creations and take on an ever-growing supply of dungeons
  
• Official Content, Too—Seven official custom dungeons from the developer available at launch, with more added over time

Your imagination becomes the next challenger's adventure. With the Workshop, NULL DUN is a game you can play forever.

Game Details

• Genre: Roguelike × Deck-Building RPG
  
• Playtime: 8–36 hours (to clear every dungeon)
  
• Saving: Auto-save supported, with the option to export your data to a file
  
• Story & Gallery: Replay any element you've already seen, anytime—also unlockable via hidden commands
  
• Collection: A card compendium and 32 achievements

A rescue a hundred years in the making—save them, with your own hands.

AI Generated Content Disclosure

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

This work incorporates the use of generative artificial intelligence (AI) in the following areas:
Parts of the artwork, parts of the sound, parts of the story, and localization.