Completed / Unity

Cyan Brain [v1.1.1] [NEKOUJI STUDIO]

October 26, 2025F95

Cyan Brain is a sci-fi horror game where players run and are pursued, by futa monsters and more….

Before downloading, please be aware
Please note that the game contains graphic violence and adult content.

Thread Updated: 2025-10-25

Release Date: 2025-10-14

Developer: NEKOUJI STUDIO Patreon – Ci-en – DLsite – Twitter

Censored: Yes

Version: 1.1.1

OS: Windows

Language: English

Store: DLsite – Steam

Genre:

2d game, animated, female protagonist, censored, vaginal sex, creampie, rape, gore, graphic violence, vore, monster girl, monster, big ass, big tits, shooter, adventure, fantasy, horror, sandbox, side scroller,

Installation:

1. Extract and run.

Changelog:

v1.1.1

Bugfixes

v1.1.0

New Dynamic CG Added (Unlockable After Clear)
2 New Monsters (Appear in Chapters 4 & 5 / Defeat Cutscenes Included)
2 New Weapons (Obtainable in Chapter 3 / Placement Changed)
Mine System Implemented (G Key Deployment / Self-Destruct Mechanism Included)

1.01
New Additions

Added 3 new reward CGs

　┗ Unlocked after clearing Stage 2, Stage 3, and Stage 4

　┗ Already-cleared save data can directly view them

Difficulty Adjustment

Made Easy Mode even easier to clear

Weapon Adjustment

Improved performance of certain weapons

Map Improvements

Adjusted layouts of certain maps

Bug Fixes

(1) Fixed issue where collected battle data would be lost if the protagonist died

(2) Fixed issue where protagonist would not appear at the correct location after loading a save

(3) Fixed freeze issue when re-entering Stage 2 and talking to HS202

(4) Fixed random crash issues

(5) Fixed freeze when opening doors in maps

(6) Fixed issue where some enemies would freeze in maps

(7) Fixed issue where protagonist could still roll during NPC dialogue

(8) Fixed incorrect UI display when restoring HP

(9) Fixed missing collision in some map areas

(10) Fixed negative ammo count issue

2025-08-13

Full Release

Demo 4.0

N/A

Demo 8.1

Base/Story System/Content Update

Demo 6.14

♦ New weapons

♦ A device for replenishing ammunition

♦ A feature to expand the field of view

♦ Several new screen effects

*Please note that save data from the previous version will no longer be usable.

**Please be aware that this version is a test release and may contain bugs that could affect the gameplay experience. We appreciate your understanding and valuable feedback.

Ch.01 Test Demo

Dear followers, thank you very much for your continued support.

After much hard work, we are pleased to announce that the test version of Chapter 01 of [CYAN BRAIN] is now complete. We have uploaded the game content files so that our sponsors can play it.

Due to time constraints, the story and dialogue content within the game have not yet been implemented. We plan to update the scenario system in the game by next month.

This update includes the prologue map and related gameplay content, as well as new scenes, monsters, traps, and a boss.

There is a possibility that the game save data may contain bugs. If you encounter any issues with the save data, please delete it and create a new save to play.
The current version is a test version and may contain bugs that affect the gameplay experience. We appreciate your understanding and valuable feedback.

The content to be added in the next update includes the following:

△ Dialogue and collectible items for Chapter 1 to deepen the understanding of the story

△ New NPC characters

△ Many more new weapons

△ Base system update, allowing various activities at the base

△ Addition of an animation viewing mode

Developer Notes:

18+ Only

DOWNLOAD
Win: DATANODES – MEGA – PIXELDRAIN – VIKINGFILE – WORKUPLOAD

Extras: Monster Sample – Cheat Table1* – Cheat Table2*
*This unofficial port/version is not released by developer, download at your own risk.