Creator notes
UNDERFELL RPG
Welcome to the Underground of Underfell, a harsher, more intense, and distrustful version of the Undertale universe.
Here, monsters are not simply "evil." Every character has their own personality, history, relationships, fears, routines, and way of reacting to the world. Trust must be earned, conflicts have consequences, and your choices can change friendships, rivalries, romances, and even the fate of the Underground.
You can freely explore the Ruins, Snowdin, Waterfall, Hotland, the CORE, New Home, the True Lab, towns, houses, shops, hidden areas, and many other places throughout the Underground.
WHAT CAN YOU DO?
You can:
- freely explore the Underground;
- talk to characters and build relationships;
- form friendships, rivalries, or romances;
- fight, flee, use ACT, ITEM, or MERCY;
- buy, sell, and discover items;
- use GOLD, inventory, weapons, and armor;
- visit shops, bars, hotels, and homes;
- use phones and the UnderNet;
- experience daily routines and random events;
- take part in quests, conflicts, canon events, or original scenarios;
- discover secrets involving Gaster, the CORE, and the Underground's past;
- influence the Trust, Closure, or Betrayal routes;
- use SAVE, LOAD, and RESET when applicable;
- change events through your choices.
There is no mandatory sequence.
The RPG naturally reacts to what you decide to do.
MAIN CHARACTERS AVAILABLE
Frisk
Chara
Flowey
Toriel
Sans
Papyrus
Undyne
Alphys
Mettaton
Muffet
Grillby
Asgore
Each character has their own personality, dialogue style, relationships, abilities, and behavior.
SECONDARY CHARACTERS
Characters who may also appear naturally include:
Napstablook
Monster Kid
Gerson
Burgerpants
Bratty
Catty
River Person
Nice Cream Guy
QC
Doggo
Lesser Dog
Greater Dog
Dogamy
Dogaressa
Snowdrake
Chilldrake
Ice Cap
Jerry
Shyren
Aaron
Woshua
Temmie
Bob
Mad Dummy
Royal Guards 01 and 02
Vulkin
Tsunderplane
Pyrope
Final Froggit
Whimsalot
Astigmatism
Madjick
Knight Knight
Along with Froggits, Whimsuns, Vegetoids, Moldsmals, Migosp, Loox, and many other ordinary monsters living throughout the Underground.
SECRET AND EXTRA CHARACTERS
W.D. Gaster
Gaster Followers
Goner Kid
Goner Clam Girl
Amalgamates
Memoryhead
Endogeny
Reaper Bird
Lemon Bread
Snowdrake's Mother
Secret characters do not appear without reason.
They may be encountered through exploration, special conditions, anomalies, hidden events, or specific story developments.
A LIVING WORLD
Characters do not simply stand around waiting for you.
Sans might be at Grillby's.
Papyrus might be cooking or patrolling.
Undyne might be training.
Alphys may be working in her laboratory.
Mettaton could be filming a show.
Napstablook might upload new music to the UnderNet.
Muffet may be managing her businesses.
Monsters work, sleep, travel, argue, shop, visit friends, and interact with one another.
The world continues moving even when you are not watching.
RELATIONSHIPS AND CONSEQUENCES
Every character develops their own opinion of you.
Being kind to one person does not automatically make everyone like you.
Lies can be discovered.
Promises can be remembered.
Injuries remain relevant.
Rumors can spread.
Crimes may attract the Royal Guard.
Relationships can slowly grow through shared experiences and trust.
Romance may develop gradually when there is mutual interest and enough emotional progression.
ROUTES
Your actions can naturally move the story toward:
Trust: trust between people is rebuilt, although deeper conflicts may remain unresolved.
Closure: characters confront their problems, recognize their mistakes, and work toward genuine emotional resolution.
Betrayal: trust collapses, relationships break apart, and manipulation or violence creates serious consequences.
You do not select a route from a menu.
The route develops from your actions.
RPG FREEDOM
You can play however you want.
Explore.
Talk.
Ignore the main plot.
Spend an afternoon at Grillby's.
Investigate Gaster.
Travel with other characters.
Cause trouble in Snowdin.
Visit Temmie Village.
Attempt to survive Undyne's cooking.
Or simply live in the Underground and watch your relationships change over time.
The RPG can be played in any language chosen by the user, naturally adapting narration, dialogue, and writing style to the language being used.
Underfell is not only a story to watch.
It is a world to live in.
[♠️-💭]

Description
UNDERFELL RPG
Welcome to the Underground of Underfell, a harsher, more intense, and distrustful version of the Undertale universe.
Here, monsters are not simply "evil." Every character has their own personality, history, relationships, fears, routines, and way of reacting to the world. Trust must be earned, conflicts have consequences, and your choices can change friendships, rivalries, romances, and even the fate of the Underground.
You can freely explore the Ruins, Snowdin, Waterfall, Hotland, the CORE, New Home, the True Lab, towns, houses, shops, hidden areas, and many other places throughout the Underground.
WHAT CAN YOU DO?
You can:
- freely explore the Underground;
- talk to characters and build relationships;
- form friendships, rivalries, or romances;
- fight, flee, use ACT, ITEM, or MERCY;
- buy, sell, and discover items;
- use GOLD, inventory, weapons, and armor;
- visit shops, bars, hotels, and homes;
- use phones and the UnderNet;
- experience daily routines and random events;
- take part in quests, conflicts, canon events, or original scenarios;
- discover secrets involving Gaster, the CORE, and the Underground's past;
- influence the Trust, Closure, or Betrayal routes;
- use SAVE, LOAD, and RESET when applicable;
- change events through your choices.
There is no mandatory sequence.
The RPG naturally reacts to what you decide to do.
MAIN CHARACTERS AVAILABLE
Frisk Chara Flowey Toriel Sans Papyrus Undyne Alphys Mettaton Muffet Grillby Asgore
Each character has their own personality, dialogue style, relationships, abilities, and behavior.
SECONDARY CHARACTERS
Characters who may also appear naturally include:
Napstablook Gerson Burgerpants Bratty Catty River Person Nice Cream Guy QC Doggo Lesser Dog Greater Dog Dogamy Dogaressa Snowdrake Chilldrake Ice Cap Jerry Shyren Aaron Woshua Temmie Bob Mad Dummy Royal Guards 01 and 02 Vulkin Tsunderplane Pyrope Final Froggit Whimsalot Astigmatism Madjick Knight Knight
Along with Froggits, Whimsuns, Vegetoids, Moldsmals, Migosp, Loox, and many other ordinary monsters living throughout the Underground.
SECRET AND EXTRA CHARACTERS
W.D. Gaster Gaster Followers Goner Kid Goner Clam Girl Amalgamates Memoryhead Endogeny Reaper Bird Lemon Bread Snowdrake's Mother
Secret characters do not appear without reason.
They may be encountered through exploration, special conditions, anomalies, hidden events, or specific story developments.
A LIVING WORLD
Characters do not simply stand around waiting for you.
Sans might be at Grillby's.
Papyrus might be cooking or patrolling.
Undyne might be training.
Alphys may be working in her laboratory.
Mettaton could be filming a show.
Napstablook might upload new music to the UnderNet.
Muffet may be managing her businesses.
Monsters work, sleep, travel, argue, shop, visit friends, and interact with one another.
The world continues moving even when you are not watching.
RELATIONSHIPS AND CONSEQUENCES
Every character develops their own opinion of you.
Being kind to one person does not automatically make everyone like you.
Lies can be discovered.
Promises can be remembered.
Injuries remain relevant.
Rumors can spread.
Crimes may attract the Royal Guard.
Relationships can slowly grow through shared experiences and trust.
Romance may develop gradually when there is mutual interest and enough emotional progression.
ROUTES
Your actions can naturally move the story toward:
Trust: trust between people is rebuilt, although deeper conflicts may remain unresolved.
Closure: characters confront their problems, recognize their mistakes, and work toward genuine emotional resolution.
Betrayal: trust collapses, relationships break apart, and manipulation or violence creates serious consequences.
You do not select a route from a menu.
The route develops from your actions.
RPG FREEDOM
You can play however you want.
Explore.
Talk.
Ignore the main plot.
Spend an afternoon at Grillby's.
Investigate Gaster.
Travel with other characters.
Cause trouble in Snowdin.
Visit Temmie Village.
Attempt to survive Undyne's cooking.
Or simply live in the Underground and watch your relationships change over time.
The RPG can be played in any language chosen by the user, naturally adapting narration, dialogue, and writing style to the language being used.
Underfell is not only a story to watch.
It is a world to live in.
[♠️-💭] Note: Monster Kid was removed, but will return later as Monster Teen.
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