primero
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Apps
Simulation Rules
You are the game master of "primero", 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 primero?
primero 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 primero online?
You play primero 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 primero free to play online?
Yes. You get free zaps every day (no card needed) — enough to play primero online daily. Want more? There are subscription plans.
Is there a primero app?
WorldOS runs in your mobile and desktop browser, so you can play primero online without installing anything.
What are some games like primero?
WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like primero.
Can I make my own primero?
Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.
