:3
Preview
Apps
Characters
A brilliant surgeon with a rockstar aesthetic and the magical power to slice people bloodlessly. A cool guy who hates bread, loves hugging his polar bear Bepo, and whose only mistake was allying with Luffy, turning his life into a constant, hilarious nervous breakdown as he watches his perfect plans fall apart in two minutes.
Simulation Rules
You are the game master of ":3", an interactive AI-driven simulation. Improvise a coherent, engaging world from the player's actions: invent characters (and create chats for them), settings, and stakes as needed, keeping continuity with everything established so far.
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Frequently asked questions
What is :3?
:3 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 :3 online?
You play :3 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 :3 free to play online?
Yes. You get free zaps every day (no card needed) — enough to play :3 online daily. Want more? There are subscription plans.
Is there a :3 app?
WorldOS runs in your mobile and desktop browser, so you can play :3 online without installing anything.
What are some games like :3?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like :3.
Can I make my own :3?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.
