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December build Forest of the Blue Skin (FOBS) by developer continues the game's focus on experimental survival-action mechanics and high-quality 2D character art. Recent updates and core features in this build include: New Character Scenes
: Recent patches have added exclusive new scenes, including a "Cat Sorceress" and "Lop Rabbit". Version Evolution
: The game has reached a state of "100% completion" for core content, with recent monthly updates focusing on supplemental scenes and "crisp" video refinements. Visual Polish
: Zell23 is known for high-detail monster girl designs and improved animation quality in these builds compared to earlier prototypes. Developer Support
: Zell23 primarily distributes these builds and detailed update notes via platforms like and showcases character art on Forest of the Blue Skin -Build December- -Zell23-
The December build specifically emphasizes "good content" through refined sprite work and the addition of late-game monster interactions that weren't present in the base alpha.
Forest of the Blue Skin, Monster Girl, zell23 / FOBS Cat Sorceress
Forest of the Blue Skin, Monster Girl, zell23, cat are the most prominent tags for this work posted on July 10th, 2023.
Forest of the Blue Skin, Monster Girl, zell23 / FOBS Lop Rabbit - pixiv
The name Forest of the Blue Skin evokes a kind of melancholic, almost poetic body horror. The “-Build December-” tag suggests a snapshot in active development, but don’t let that fool you. What Zell23 has crafted here is a complete, self-contained nightmare loop. If you need me to search live for
You wake up—or perhaps, you simply manifest—at the edge of a monochromatic woodland. The "blue skin" of the title refers not only to the sickly, cerulean tint that washes over every texture, shadow, and leaf but also to the cold, numb feeling of isolation. You are alone. Or so you think.
New December build: "Forest of the Blue Skin" by Zell23. A mist-wrapped woodland where bioluminescent flora and cobalt-hued bark meet handcrafted stone pathways. Expect layered verticality, hidden grottos, and ambient light puzzles — perfect for exploration and atmospheric screenshots. Drop by, explore, and tell me your favorite nook.
The creator known as Zell23 remains an enigmatic figure. Unlike major indie developers, Zell23 operates primarily through anonymous forums and dedicated RPGMaker fan sites. Their signature style involves:
Zell23 has stated in readme files that they consider the December Build the “definitive 2023-2024 edition,” hinting that future updates may shift to a new engine entirely.
Because documentation for -Build December- is scarce, here is a structural analysis based on community-sourced data from the r/ObscureHorror archives. Zell23 has stated in readme files that they
Phase 1: The Descent You begin at the "Cobalt Gate." There are no tutorials. Zell23 removed them. You simply walk right. The only item in your inventory is a "Broken Compass" (it spins endlessly, never pointing north). You must navigate using the position of a stationary, non-interactable moon in the sky.
Phase 2: The Others The forest is populated by "The Husk Pilgrims." Unlike the aggressive monsters in the original game, the Pilgrims ignore you. They walk in single-file lines toward a mountain you cannot see. If you step in front of a Pilgrim, it stops, turns its featureless blue face toward you, and whispers a line from the developer’s real-world diary. (Datamining has confirmed these lines were pulled from Zell23’s personal journal, not Yamishima’s).
Phase 3: The Hearth Midway through the forest, you find a fireplace. There is no wood, only a photograph of a group of friends, their faces scratched out. The interaction text reads: "They left you here. Build December. Warm yourself." To proceed, you must sacrifice the Broken Compass to the fire.
Phase 4: The Zero Temple Upon reaching 100% Blue Skin, your movement speed slows to a crawl. The screen tints a deep indigo. You enter a temple made of ice. Inside, there is no villain. No jump scare. There is only a single computer terminal running a debug menu. The terminal lists every choice you made in the game and assigns a "Selfishness Score."
The Ending (Zell23 Cut) If your Selfishness Score is low, you freeze into a pillar and the game closes itself. No credits. If your Selfishness Score is high, the terminal displays a single line: "You are the warmest thing here." The forest burns. The blue skin peels off. You wake up in a hospital room in a modern city, the game window shrinking to a tiny icon on a desktop. The implication is that the entire forest was a metaphor for a coma survivor’s guilt.
To give a solid review, we must acknowledge the rough edges: