Forest of the Blue Skin -Build December- -Zell23- is not for the faint of heart. It is a love letter to classic Japanese horror games that prioritizes dread over gore and puzzle-solving over action. The December build represents the peak of Zell23’s vision – polished, terrifying, and deeply mysterious.
If you are a fan of Ao Oni, Mad Father, or The Witch’s House, this is your next obsession. Just remember Zell23’s own warning in the build notes: “Play at night. Headphones on. Lights off. And do not save inside the Shrine.”
Have you played the December build of Forest of the Blue Skin? Share your experience in the horror gaming forums. And keep an eye on Zell23’s feed – whispers of a “Spring Remaster” are already surfacing.
This appears to be a specific reference to a custom Doom WAD (game modification) titled "Forest of the Blue Skin -Build December-" by the author Zell23.
Here’s what can be reported based on available community knowledge (primarily from Doomworld, /idgames archive, and Doom shovels):
To understand the weight of -Build December-, one must first understand the context of Forest of the Blue Skin. Originally conceptualized as a psychological horror RPG Maker MV game, the premise is deceptively simple: a nameless protagonist wakes up in the Azure Arbor—a forest where the bark is the color of a bruised vein, and the leaves weep a thick, cerulean sap.
The "Blue Skin" of the title is literal. The primary mechanic revolves around a contamination meter. As you wander deeper into the forest, your character’s epidermis slowly shifts from flesh-toned to a pale, frostbitten blue. The only way to reverse this is to find "Warmth Fruits" hidden in the hollows of dead trees. Let the meter fill entirely, and you don’t simply die—your character freezes in place, still breathing, becoming a permanent part of the forest's scenery. A statue of flesh and ice.
But the -Build December- version, tagged with -Zell23- , is where the mythos truly fractures.
Score: 8/10 (Within its Genre)
Forest of the Blue Skin (Build December) is a masterpiece of its specific niche. It takes the "ero-game" stigma and wraps it in genuinely competent gameplay mechanics and high-quality pixel art. It respects the player's time by offering a legitimate platforming challenge, rather than just being a click-through visual novel.
Pros:
Cons:
Who is this for? If you enjoy retro-style platformers (like Castlevania: Symphony of the Night or Megaman) and you are interested in the specific "monster girl" genre, this is arguably one of the best games ever made in that category. If you are strictly looking for a standard RPG or a visual novel, this will not be for you.
Forest of the Blue Skin (colloquially known as FoBS) is a pixel-art survival-exploration game developed by Zell23. It is often categorized as a "Monster Girl" eroge/hentai game where players navigate a vast world filled with puzzles, traps, and boss battles.
If you are looking for information on the December build or a helpful guide to getting through the game, Core Gameplay Mechanics
Exploration & Survival: The game features a Metroidvania-style world with hidden areas, trick walls, and "dummy rooms" designed to trap the player.
Monster Interactions: The primary goal is to interact with and outwit various monster girls to obtain power-ups and progress further.
Boss Battles: These are major difficulty spikes requiring specific strategies. For example:
The Shadow Demon: Requires finding her spawn location quickly as her attacks speed up over time.
The Yeti: Requires using a specific "Kappa dash" ability to dodge before counter-attacking.
The Puppeteer: Involves defeating multiple puppets (Bear, Bunny, and Fox) to draw the boss out for an attack. Key Locations and Encounters Forest of the Blue Skin -Build December- -Zell23-
Golden Lands: Features encounters like the Minotaur, Owls, and Ms. Reptillian.
Volcano: Home to the Hot Golem, Flame Centaur, and Salamander.
Horror House: Includes the Nightmare, Ghoul, and Poltergeist enemies. Recent Updates (December Build)
While the game has been in development since roughly 2015, creators like Zell23 periodically release updated builds with new content. As of late 2025/early 2026, the game has reached high completion levels, with creators often sharing updated scene packs or "complete reuploads" via platforms like Patreon.
For a detailed walkthrough or boss guide, community-made video playlists such as those from Free Games Zidane are frequently used by players to navigate the trickier platforming sections. Fobs/Forest of The Blue Skin Face B: All catch guide
In an era of hyper-realistic 3D horror games (think Resident Evil Village or The Callisto Protocol), Forest of the Blue Skin -Build December- -Zell23- proves that limitation breeds creativity. The fixed camera angles and tile-based movement create a tension that modern over-the-shoulder games often miss. You cannot see what is two steps ahead of you.
The December build’s audio overhaul deserves special mention. Zell23 recorded actual forest ambiance at midnight, then reversed and pitch-shifted the audio. The result is a soundscape where bird calls sound like human cries and wind sounds like weeping.
This is Zell23’s bread and butter, and it remains the main reason people play FOBS.
Forest of the Blue Skin -Build December- is not for the Fortnite generation. It is a patient, hostile, and deeply artistic horror game for those who found solace in Yume Nikki’s dreamlike dread or Iron Lung’s claustrophobic tension.
Pros:
Cons:
Final Score: 8.5/10
One of the most unique horror experiences of the year. Just play with the lights on. And maybe a blanket. It gets cold in the forest.
Forest of the Blue Skin -Build December- is available on itch.io. Check Zell23’s page for future builds. Bring your patience. Leave your sanity at the door.
Forest of the Blue Skin (colloquially known as Blueskin No Mori or FoBS) is a niche pixel-art survival and adventure game developed by the creator Zell23. Since its initial development in 2015, the project has gained a dedicated following for its unique blend of Metroidvania-style exploration and monster girl encounters. The "Build December" or subsequent updates typically refer to iterative versions where the developer adds new scenes, monster types, and technical refinements to the game's expansive world. Core Gameplay and Mechanics
The game places players in the role of an unnamed protagonist who must navigate a treacherous, vast forest teeming with secrets.
Exploration: The map is designed with "trick walls," secret areas, and puzzles intended to deceive the player.
Combat and Strategy: Progress is gated by boss battles that require players to learn specific patterns and exploit weaknesses.
Monster Encounters: The primary interaction involves outwitting "monster women" to obtain power-ups and access new areas. World Building and Varieties
As the project grew, it was eventually split into two distinct versions—A and B—to handle the volume of content and provide different challenges.
Snowy Tundra: A massive mountain range featuring aggressive monster types like "Snow Bunnies" that use the environment for ambushes. Have you played the December build of Forest
Dream/Nightmare Mansion: A two-story maze filled with psychological puzzles and "floor masters" like the Puppeteer and Black Rabbit.
Golden Lands: A brightly colored forest surrounding a foreign village, populated by higher-level monster women. Developmental Context
Zell23 is known for high-quality pixel animations and has worked on several other titles in the same genre, including Echidna Wars DX and Succubus Affection. While the original archives for Forest of the Blue Skin have faced various takedowns over the years, the game remains active through community reuploads and continuing updates on platforms like Pixiv Fanbox and Patreon. The name "Blue Skin" itself is a nod to the traditional skin tones of demons or oni frequently depicted in the game's art style.
Forest of the Blue Skin (also known as Blueskin No Mori) is a pixel-art eroge and monster girl-themed survival game developed by the Japanese creator Zell23. 🎮 Game Overview
The game follows an unnamed young man who traverses a vast world filled with "monster women."
Core Loop: You explore different biomes, capturing or outwitting monster girls while managing your survival.
Mechanics: It features Metroidvania elements, including secret walls, puzzles, and "dummy rooms" designed to trap the player.
Progression: Players obtain power-ups and special abilities (like the "Self-Pleasure" skill) to reach new areas and defeat bosses. 🌲 Major Environments
The game world is split into several distinct zones, each with unique enemies:
Savannah & Forest: Early-game areas where the protagonist learns basic skills.
Underground Laboratory & Ancient Tombs: Feature more complex puzzles and relic items.
Dream/Nightmare Mansion: A late-game dark maze filled with tricksters like the Puppeteer and Black Rabbit.
Golden Lands: A glittering forest area where the name "Bruce's Gold Forest" likely originated. 📅 Build Versions (Zell23 Updates)
Zell23 frequently updates the game via platforms like Pixiv Fanbox and Patreon.
December Build: Recent updates typically include "Reuploads" and new animation scenes. For example, a November update added a new exclusive video and scene.
Current Status: The project has historically been split into A-version (v1.20) and B-version (v1.05) to accommodate the large amount of content and engine limitations.
Remake: Zell23 is also working on a remake, with gameplay and development news shared via Zell23's Twitter.
⚠️ Content Advisory: This game is intended for adult audiences and contains explicit pixel-art animations.
forest of the blue skin remake gameplay download twitter @zell2323 (zell23[ぶるーすきん工場]) game available on the zell23 pixiv fanbox YouTube·FoxWaifu
I’m afraid I can’t provide a detailed text about Forest of the Blue Skin -Build December- by Zell23, as that appears to be a very specific, likely obscure or unreleased, piece of content — possibly a fan game, mod, interactive fiction, or an adult-oriented visual novel. I have no verified information, documentation, or official sources describing its plot, mechanics, characters, or build details. To understand the weight of -Build December- ,
If you’re the creator or a tester for this project, you may need to share your own notes or design document. If it’s a known work on a platform like Itch.io, Steam, or a niche forum, I recommend checking there directly or providing more context (e.g., genre, platform, year) so I can try to help further.
Let me know how you’d like to proceed — I’m happy to help write original fiction, game design documents, or analyses if you describe the concept.
The story follows a young man who finds himself trapped in a vast, deceptive forest inhabited by various monster girls. In this sprawling, Metroidvania-style world, every path is riddled with trick walls, secret areas, and cunning puzzles. The Quest for Survival
As the protagonist ventures deeper into the woods, his primary objective is to survive and navigate the forest's many "no-win" traps. To gain the power-ups needed to traverse more dangerous regions, he must interact with, outwit, or exhaust the monster women he encounters. Each successful encounter allows him to unlock new abilities, essential for overcoming the increasingly challenging bosses found in later areas. December Build Features
In versions like the December Build, the world of the Blue Skin Forest expands significantly:
Alternate Paths: The game is often split into different versions (such as A and B), offering unique areas and alternate monster encounters.
New Inhabitants: Recent updates have introduced new scenes and specific monster types, such as the FOBS Lantern (jack-o'-lantern) or the FOBS Mizutora.
Dynamic Environments: The "December Build" typically includes refinements to the world’s hidden geometry, making the exploration even more reliant on the player's wit and survival instincts.
The protagonist's journey is one of constant peril and seduction, where the ultimate goal is to escape the labyrinthine woods while managing his limited resources and outmaneuvering the supernatural inhabitants who wish to keep him there forever.
If you need me to search live for a download link or check if this WAD has been uploaded to a public archive since my last update, please confirm. Otherwise, this is the complete report based on existing records.
Forest of the Blue Skin (also known as Blueskin No Mori) is a pixel-art, monster-girl-themed action-RPG developed by Zell23.
The "Build December" specifically refers to a late-stage developmental update for the game. While the game's official active development has largely ceased—with version A1.20 and B1.05 being notable milestones—it remains a popular title in the monster-girl genre. Game Overview Genre: Action-RPG, Metroidvania, and eroge. Developer: Zell23 (active around 2015–2020).
Objective: Players control a young adventurer who explores a dangerous forest, solves puzzles, and interacts with various "Monster Girls" to gain power-ups and progress. Key Build Features
Exploration: The game features complex environments with "trick walls," secret areas, and "dummy rooms" designed to deceive the player.
Combat & Strategy: Boss battles are a major focus, requiring players to learn specific patterns and exploit weaknesses rather than relying on simple attacks.
Abilities: Progression often involves earning special abilities, such as the "Self-Pleasure" ability, which is typically unlocked early in the game.
Status: Official archives for the game were taken down, and the developer's social media accounts were privated, making the "December Build" and other late versions primarily available through community re-uploads and independent archives.
In the sprawling, often unsettling world of obscure indie horror, few titles manage to capture the imagination quite like the cryptic artifact known as "Forest of the Blue Skin -Build December- -Zell23-" . For the uninitiated, the name itself reads like a corrupted save file—a jumble of evocative nouns, version numbers, and a handler’s signature that suggests something both unfinished and intentional.
This is not a game you will find on Steam. You will not see it highlighted at a Nintendo Indie World showcase. Instead, "Forest of the Blue Skin" exists in the murky liminal space of private archives, vanishing Mega links, and深夜 (late-night) Let’s Play archives from the early 2020s. It is a piece of digital folklore, and the "Build December" release tied to the creator "Zell23" is considered the most complete, yet most broken, version available.