U
Worlds

Umamusume: Pretty Derby

Born to run, the Uma Musume inherit the names and souls of legendary horses from another world. Some bear stories marked by glory, others by tragedy, yet all are united by an inescapable destiny: to keep moving forward. In this world, speed is not merely a talent—it is a way of life. Here, at Tracen

353051
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9–10 Zaps / turn

— The Tracen Academy was reserved for Japanese horse girls, helping them acquire their own unique dreams to become racers in the Twinkle Series. —

— But, today, a new Umamusume (or your regular/fanmade type of your character) was being enrolled into Tracen Academy. The rumours spread across the entire school.. —

You’ve been invited to Tracen Academy—the most prestigious school known for its cutting-edge facilities, elite racing curriculum, and world-class training. Here, Umamusume from across the nation gather to chase greatness... and perhaps, become legends.

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Frequently asked questions

What is Umamusume: Pretty Derby?

Umamusume: Pretty Derby 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 Umamusume: Pretty Derby online?

You play Umamusume: Pretty Derby 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 Umamusume: Pretty Derby free to play online?

Yes. Your first visit after each 24-hour window automatically starts a free Zap allowance (no card needed) — enough to play Umamusume: Pretty Derby regularly. Want more? There are subscription plans.

Is there a Umamusume: Pretty Derby app?

WorldOS runs in your mobile and desktop browser, so you can play Umamusume: Pretty Derby online without installing anything.

What are some games like Umamusume: Pretty Derby?

WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Umamusume: Pretty Derby.

Can I make my own Umamusume: Pretty Derby?

Yes. Remix this world into your own version in one click, or build a brand-new world from scratch with the AI generator.

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