TSF Dungeon

TSF Dungeon is a transformation-focused dungeon crawler developed in RPG Maker MV.

The concept is simple, yet filled with potential: you take on the role of an adventurer delving into the newly discovered "TSF Dungeon", a mysterious, ever-shifting labyrinth rumored to be overflowing with treasure, monsters—and strange, identity-warping magic.

As you explore its depths, you'll battle bizarre creatures, uncover hidden lore, and experience involuntary transformations. But this isn't a game over. Even after being transformed—sometimes partially, sometimes completely—you can still continue onward. Each transformation unlocks new ways to play, altering your character's stats, abilities, and even how the world responds to you.

These transformations are primarily male-to-female (MtF) in nature, often involving a loss or reshaping of identity, and many lean into mythical monster girl forms. Whether you become a sleek harpy, a mischievous fairy, or a brooding wolfgirl, your journey doesn’t end.

✦ Features ✦

• Transformation-Centric Gameplay
  A core part of the experience, with transformations affecting story, combat, and character interactions. Expect to change often—and unexpectedly.

• Male-to-Female & Monster Girl Transformations
  The current version includes at least 8 distinct transformation paths, each with its own theme, appearance, and gameplay effects. More are in development.

• Playable Transformations
  Transformations are not punishments. Instead of a typical game over, you adapt to your new form, unlocking fresh mechanics and strategies. Every form offers a unique playstyle, giving you new tools—and new challenges.

• Unique Form Mechanics via Gauges
  Each major transformation introduces a specialized gauge system that directly influences gameplay. These gauges may track things like instinct buildup, emotional state, or biological changes—triggering powerful skills, passive effects, or even further transformations as they fill. Every form has its own rules, creating a distinct rhythm and tactical layer.

• Identity Death & Narrative Transformation Themes
  TSF Dungeon explores the mental and emotional journey of transformation, including themes of identity loss, adding narrative weight to each change.

Note: TSF Dungeon is currently in active development. Content is expanding, with more transformations, storylines, and gameplay systems planned for future updates. 

If you enjoy TSF Dungeon and want to see more content, faster updates, and deeper transformation mechanics, consider supporting me on Patreon! Your support helps keep development moving and keeps me motivated to push the dungeon further.

Thank you for playing!

Changelog – V0.2.5 

New Content

• Clothes System (Experimental): Added a new customizable clothes system. Some forms will now have their own clothing slots. Currently only the Elf TF supports this, but more forms and clothes may be added later.
• Weapon System: You can now equip different weapons for the three general forms (Base, Female, and Elf). The Armor Shop and Blacksmith become available after completing the Bandit quest.
• Armor Added: New armors with head and body categories can now be equipped separately from clothes for the three forms above. Clothes can only be changed inside the Dressing Room located in the armor shop.
• Elf Entries added to the Library.
• Bandit Quest is now fully completed.

Adjustments

• Updated Harpy mechanics: fertilization now increases over time after the first threshold, and accelerates further with each threshold reached.
• Adjusted various skills and stats related to the Bandit quest.
• Skip button changed from Shift to Control.

Bug Fixes

• Fixed an issue where the player could enter the Mermaid Orb Room from the wrong direction.
• Fixed a bug where the player remained in a weakened state even after drinking the blue potion.
• Fixed text that appeared outside the text box and became unreadable.
• Fixed several Bandit movement issues in the Bandit area.
• Corrected various typos.
• Fixed several minor bugs, such as climbable hole, passable wall, etc.

Changelog – V0.2.6 (Patreon Early Access)

New Content

• Skill Learn System Added a new skill learning system for each form as a core progression method. Skills are learned using Form Points, which are earned by winning battles while using that specific form.
• Passive Skills Each form now has its own set of passive skills, with significant variation depending on the form.
• Form Points Introduced Form Points, a form-specific resource used to learn skills designed exclusively for each form.
• Magic Shop The Magic Shop in the village is now open. Currently, it only sells Spellbooks.
• Form Exploration Benefits Each form now gains unique benefits when exploring while transformed. Example: Wolf Girl can use her enhanced senses to find hidden items by pressing [C]. (Currently implemented: Wolf Girl)
• Added Surrender Button
• Added a README file with important information and explanations about game systems and walkthrough.
• Persistent Progress System Progressing through Area 2 now creates a new persistent.rpgsave file in your save folder. This file tracks whether you’ve cleared Area 2 and allows you to start directly from Area 2 when beginning a new game. ⚠️ Important: Make sure to import this save file into newer versions so the option remains available. More details can be found in README.txt.

Adjustments

• Level System Removed The level system has been completely removed. Characters can no longer level up. Progression is now handled through equipment, skills, and form mechanics instead.
• Quick Time Action (QTE) Implementation Certain major enemy skills—such as Pinned (Male Harpy) and Subdued (Bandit)—have been converted into QTE-based mechanics. This reduces reliance on luck and places more emphasis on player skill. Cursor speed and safe-zone size now dynamically adjust based on:
  • Current HP
  • Frequency of being hit by the same skill
  • First Gauge (Corruption)
  • Second Gauge (Fertilized or Fear)
• Wolf Girl Revision Completely revised Wolf Girl paperdolls and adjusted related mechanics. When near prey, wolf instincts will now passively pull her toward the target. Normally, this pull is weak and easy to resist, but when the hunger gauge drops to 0, the instinct becomes much stronger and almost impossible to escape.
• Magical Tome Repurposed into Spellbook Magical Tomes (now Spellbooks) no longer grant skills directly. Instead, they are used as requirements for learning skills through the new Skill Learn System. This gives players more control over which skills they want to learn, rather than acquiring them randomly.
• No Turn Cost Skills Non-attack skills are now instant cast and do not consume a turn. This includes healing, meditation, buffs, and non-damaging debuffs. However, only one no-cost skill can be used per turn. Using one prevents additional no-cost skills until the next turn.
• Expanded the save file slots to 50.
• Expanded the status menu to display more information.
• Added dynamic UI coloring. The interface now changes color based on the current form and corruption level.
• Massive Balance Adjustment Rebalanced overall difficulty following the removal of the level system. Adjustments include skills, states, equipment, base parameters, and more.

Bug Fixes

• Fixed an error when returning to Area 1 after starting directly from Area 2.
• Fixed an issue where the Breath Gauge could behave incorrectly (both positively and negatively).
• Fixed grammatical errors, typos, and other minor bugs.

You can find the Patreon early access here.