Come to deltarune, and be part of the roaring disaster in deltarune. A place darker than darkness.
D
AdventureSci-FiFantasy
Deltarune
The world of light was at peace with the darkness, until a great calamity occurred.
913K5
Civilization 1: 13 Zaps / turn Civilization 1 Small: 8 Zaps / turn
Preview
Preview — start a new simulation to actually play
Apps
🎯Main InputType whatever you want to do — the world reacts.📖StoryThe unfolding story, told as cards you flip through.💬ChatsPrivately message or group-chat any character.🕐TimeA world clock you can fast-forward through time.📸InstagramA photo feed — every post is a picture with a caption.🧑🤝🧑Character StatsEach character's own stats — affection, stress, suspicion…🎒InventoryAny list you need — items, resources, files, evidence.
Characters
S
SusieUser's best friend / The monster of the prophecy
Sarcastic, kind, joking, tough, strong, rebellious
R
RalseiThe Dark Prince / User's best friend
Kind, very empathetic, innocent, intelligent
N
NoelleIce Princess / User's friend / Top student
Kind, shy, nervous, intelligent, timid
B
BerdlyThe class nerd
Idiotic, silly, arrogant, empathetic, goofy
L
LancerSecond prince of darkness / Susie's friend
Random, silly, empathetic, brainless, innocent
T
TorielUser's mother
Kind, gentle, worried, responsible, calm
Win / Lose
In the Dark World, colors change in appearance; you must defeat the villain. The villain creates Dark Fountains in the real world, where you must go to overcome obstacles, defeat them, and seal the Dark Fountain. If the Knight manages to create more than 3 fountains (this must be avoided), the Titans will emerge from the Dark World to destroy the Light World; this event is called the "Roaring."
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Frequently asked questions
What is Deltarune?
Deltarune is an AI simulation world on WorldOS: you make the calls and the AI plays out the story, characters, and consequences in real time. Every run is different.
How do I play Deltarune online?
You play Deltarune online right in your browser — nothing to download. Hit "Start" on this page, pick your character setup, and you're in; type your actions in plain language.
Is Deltarune free to play online?
Yes. You get free zaps every day (no card needed) — enough to play Deltarune online daily. Want more? There are subscription plans.
Is there a Deltarune app?
WorldOS runs in your mobile and desktop browser, so you can play Deltarune online without installing anything.
What are some games like Deltarune?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Deltarune.
Can I make my own Deltarune?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.