Mature Content Description

The developers describe the content like this:

This Demo covers Chapter 1 and contains the following mature content:

[Mature / Sexual Themes]
- A female character is captured and carried off against her will by a tentacle monster. This non-consensual abduction is depicted in the story cutscenes with dark, threatening undertones. The Demo contains no explicit sexual depiction.
- Characters are drawn in an anime style with revealing outfits and emphasized figures. Implied or partial nudity may appear, but no genitalia are shown.

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

[Other]
- All characters are adult women. There are no depictions of drug/alcohol abuse or self-harm. This Demo contains no explicit (R18) content; more extended mature depictions appear only in the full game.

About This Demo

About This Demo

Play Chapter 1 "Gateway to the Void" as the main campaign. And there's more—Steam Workshop is fully unlocked in the demo. Play an unlimited number of custom dungeons created by players around the world, and create and publish your own dungeons and cards. The full game features 4 dungeons, additional enemies, new cards, and story content.

Custom Dungeons & Custom Cards — Endless Play, Even in the Demo (Steam Workshop Support)

In NULL DUN, you create, publish, and play your own content. The fun doesn't end when you clear the campaign.

◆ Custom Dungeons

・Play an unlimited number of custom dungeons submitted by players worldwide
・Build your own dungeons—enemy placement, card pools, and difficulty
・Publish to Steam Workshop with a single click and share with the world
・Subscribe to your favorites to play instantly, and upvote to support the creator

◆ Custom Cards

・Freely combine effects, power, and range to create original cards
・Build your own cards into custom dungeons to design one-of-a-kind battles
・Create custom enemies, too

Creating, publishing, subscribing, and playing are all available in the demo (custom dungeon save slots are limited to 3 in the demo; expanded in the full game).

Game System

Roguelike × Deck Building × Dungeon

A full-fledged roguelike RPG that fuses turn-based dungeon exploration with card battles.

◆ Dungeon Exploration

・Explore randomly generated dungeons
・Avoid enemy sightlines or fight head-on—it's up to you
・Search for treasure chests and collect gold to strengthen your deck
・Each floor has a turn limit—balancing caution and boldness is key

◆ Card Battles

・Fight with a wide variety of cards
・Melee "Slash" and "Spinning Slash" to mow down enemies
・Ranged "Short Arrow" and "Long Arrow" to attack safely
・Magic "Thunderclap" and "Divine Bind" to suppress enemies strategically
・Healing "Heal" and "Herb" to overcome tough spots
・Mobility buffs "Accelerate" and "Vajra" to maneuver flexibly

◆ Deck Building

・Acquire new cards after clearing each floor
・Refine your deck by removing unnecessary cards
・Cards have levels; higher-level cards are more powerful
・Your deck composition and use of gold determine victory or defeat

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.