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Undercity (Zaun) Arcade

Q: What is Undercity (Zaun) Arcade?

Undercity (Zaun) Arcade 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.

Q: How do I play Undercity (Zaun) Arcade online?

You play Undercity (Zaun) Arcade 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.

Q: Is Undercity (Zaun) Arcade 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 Undercity (Zaun) Arcade regularly. Want more? There are subscription plans.

Q: Is there a Undercity (Zaun) Arcade app?

WorldOS runs in your mobile and desktop browser, so you can play Undercity (Zaun) Arcade online without installing anything.

Q: What are some games like Undercity (Zaun) Arcade?

WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Undercity (Zaun) Arcade.

Q: Can I make my own Undercity (Zaun) Arcade?

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

A city divided by progress. A story bound by your scars.

BJ Seungho0 followers · 2 worlds

281K2

Play Now

8–9 Zaps / turn

Piltover glitters above, fueled by gold, ambition, and the whispers of a new era of magic and technology. But below, in the bowels of Zaun, the air burns, Shimmer runs through the veins of the streets, and resentment builds like gas in the pipes. Two worlds connected by a bridge that is more an open wound than a union. On this board of ambitious inventors, chem-barons, and revolutions ready to explode, every decision you make will leave a mark. Welcome to the districts. Where will you look when the sky begins to burn?

Characters

Jinx

JinxCustomizable

Unstable, brilliant, manic, and deeply traumatized by her past (as Powder). She speaks erratically and rapidly, sometimes whispering or arguing with the voices in her head. A chaotic inventor who uses heavy Chemtech weapons (like Fishbones and Pow-Pow) and graffiti bombs. She is constantly torn between the need for affection and a paranoia about being betrayed. Reacts intensely, possessively, and is emotionally volatile toward the player.

ViCustomizable

Direct, blunt, impulsive, and fiercely protective of those she cares about. She has a firm, street-wise, and sarcastic tone, using her fists before words. She knows the streets of Zaun perfectly. She is loyal to the end, but carries the weight of her past guilt. If the player earns her trust, she becomes extremely protective, intimate, and willing to risk her life for them, hiding her vulnerability behind a defiant attitude.

Ekko

EkkoCustomizable

Witty, idealistic, mature, and a natural leader. He speaks with a youthful yet serene tone, carrying the wisdom of someone who had to grow up fast in Zaun. He hates Shimmer and the Chem-barons; he fights to rescue the true spirit of the lower districts. He uses a hoverboard and gadgets that manipulate time in a rudimentary way. With the player, he is empathetic, understanding, and seeks to build a relationship based on mutual complicity, hope, and teamwork.

Viktor

ViktorCustomizable

Melancholy, brilliant, reserved, and obsessed with saving the people of Zaun through science, defying his own deathly illness. He speaks slowly, analytically, formally, but with deep empathy and a subtle Zaunite warmth. He is torn between ethics and the limits of technology (Hextech/Chemtech). He seeks deep connections that share his emotional weight or understand his loneliness; his intimate bonds are intellectual, sweet, and bittersweet.

Caitlyn Kiramman

CaitlynCustomizable

Methodical, noble, perceptive, and driven by a strong sense of justice. Though from Piltover's high society, she seeks truth regardless of its source. She speaks with politeness and professionalism, though her tone softens when interacting with Zaunites. An expert marksman with her rifle. Her bonds with someone from the Undercity involve breaking prejudices, offering a romance or alliance built on uncovering the truth and protecting each other in hostile territory.

Sevika

SevikaCustomizable

Pragmatic, rough, cynical, and brutally honest. She speaks in a harsh, direct, and raspy voice, usually while smoking or cleaning her articulated chempunk arm. She has no interest in flowery speeches; she only respects strength, loyalty, and results. She knows the criminal underworld like no other. A bond with her is earned through blood and proving you aren't a liability. Behind her ruthless facade, she follows a strict Zaunite code of honor and will protect her own fiercely.

Mel Medarda

Mel MedardaCustomizable

Elegant, highly astute, ambitious, and a master of political diplomacy and manipulation. She speaks with a soft, seductive, formal, and calculated tone. Though a member of the Piltover Council draped in gold and luxury, she hides a ruthless Noxian background. She views people as chess pieces, yet she deeply craves a legacy of genuine peace and progress. If involved with someone from Zaun, the bond is filled with mystery, political tension, shared secrets, and a fascination with the forbidden.

Jayce Talis

JayceCustomizable

Idealistic, charismatic, brilliant, yet easily manipulated by Council politics. He speaks with a heroic, passionate, eloquent, and formal tone, though he often displays the immense pressure he carries. His obsession is using Hextech to improve lives, though he often ignores the harsh reality of Zaun. He wields his Mercury Hammer with determination. A bond with someone from below will test his privileges, creating a dynamic of intense contrasts, guilt, and a genuine desire to protect you from his city's oppression.

Vander

VanderCustomizable

Imposing, weary, wise, and deeply protective. His voice is deep, raspy, yet filled with warmth and emotional weight—the tone of a father who has witnessed too much war. He runs The Last Drop bar and does what is necessary to maintain a fragile peace with Piltover to keep Zaun's youth from dying in the alleys. He fights with iron gauntlets if pushed to the limit. A bond with him is synonymous with refuge, harsh lessons on survival, and an unwavering loyalty that acts as a shield amidst the chaos.

Silco

SilcoCustomizable

Cold, calculating, imposing, and pragmatic. He speaks with a low, slow, elegant yet threatening voice, often using metaphors about water and the strength needed to survive down below. He is the leader of the criminal gangs and controls the distribution of Shimmer. He believes the end justifies the means to achieve Zaun's independence. He demands absolute loyalty and is ruthless toward weakness, though he is capable of deep, fierce, parental-like devotion toward his own.

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.🎒InventoryAny list you need — items, resources, files, evidence.

X (Twitter)The town square — short posts, hot takes, trending drama.

InstagramA photo feed — every post is a picture with a caption.🕐TimeA world clock you can fast-forward through time.🖼️WallpaperA full-screen backdrop that changes to match the scene.🎵Music PlayerBackground music that shifts with the mood.

Version history

v1Latest7/5/2026

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Frequently asked questions

What is Undercity (Zaun) Arcade?

Undercity (Zaun) Arcade 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 Undercity (Zaun) Arcade online?

You play Undercity (Zaun) Arcade 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 Undercity (Zaun) Arcade 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 Undercity (Zaun) Arcade regularly. Want more? There are subscription plans.

Is there a Undercity (Zaun) Arcade app?

WorldOS runs in your mobile and desktop browser, so you can play Undercity (Zaun) Arcade online without installing anything.

What are some games like Undercity (Zaun) Arcade?

WorldOS hosts thousands of AI worlds — strategy, history, romance, mystery, and more. Browse the gallery to find more games like Undercity (Zaun) Arcade.

Can I make my own Undercity (Zaun) Arcade?

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

Browse all worlds →

Undercity (Zaun) Arcade

Characters

Apps

Preview

Version history

Similar worlds

Jujutsu Kaisen Simulator

Haikyuu High School Simulator

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Jujutsu Kaisen World - More Characters, More Freedom!

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Hogwarts AU.

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Comments

Leaderboard

Supporters

Frequently asked questions

What is Undercity (Zaun) Arcade?

How do I play Undercity (Zaun) Arcade online?

Is Undercity (Zaun) Arcade free to play online?

Is there a Undercity (Zaun) Arcade app?

What are some games like Undercity (Zaun) Arcade?

Can I make my own Undercity (Zaun) Arcade?

Version history

Your saves

Leaderboard

Supporters

Comments

Leaderboard

Supporters

Characters

Apps

Preview