Introduction
Oopsie Jumpsie: Multiplayer is a fast, competitive social runner built for Meta Horizon Worlds, designed to get players jumping, dodging, and competing with friends within seconds.
Created as a mobile-first, portrait-mode experience, the game challenges players to survive as long as possible in a colourful, ever-changing world — racing side-by-side and comparing distance in real time. Each run is short, intense, and instantly replayable.
The project was developed as part of the Meta Horizon Creator Competition: Mobile Genre Showdown – Reloaded, where it won the Judges’ Choice Award. Beyond the competition, Oopsie Jumpsie served as a focused experiment: could a complete, polished multiplayer game be built entirely using Meta’s built-in GenAI tools — from environments to audio — without sacrificing coherence, performance, or fun?
The Challenge
Our goals for Oopsie Jumpsie were deliberately ambitious:
- Create a multiplayer, portrait-mode 3D game optimised for mobile.
- Achieve sub-3-second onboarding from load to gameplay.
- Design a core loop that is instantly understandable, yet competitive.
- Build a world that feels fresh every run, without frustrating players at higher speeds.
- Use 100% GenAI-generated assets while maintaining a consistent visual and audio style.
On the technical side, we also needed to:
- Ensure fair procedural layouts at increasing speeds.
- Keep performance stable in a live multiplayer environment.
- Design clean, readable UI and camera framing for vertical play.
Solution
We focused on a single, elegant loop — jump → dodge → survive → retry — and built every system around supporting that clarity and speed.
Core Gameplay & Systems
- Procedural Fragment Spawning
A custom fragment-based spawning system generates a new layout every run, ensuring variety while preserving fairness and readability at high speeds. - Multiplayer Racing Layer
Players run side-by-side in real time, comparing distance live and competing for personal and global rankings. - Mobile-First Controls
Intuitive tap and swipe input enables instant onboarding, with increasing speed adding mastery rather than complexity.
GenAI-Driven World Building
- 100% GenAI Assets
All 3D models, environments, textures, sound effects, and ambient audio were generated using Meta’s GenAI tools, including Mesh and Environment generation, Texture generation, Audio generation, and Creator Assistant. - Visual Cohesion
Environment fragments were carefully blended and curated to ensure a unified aesthetic despite being fully AI-generated.
Camera, UI & Feedback
- Portrait Camera System
Built using the Camera API to maintain a clean, readable vertical view optimised for mobile screens. - Mobile-Optimised UI & Haptics
Minimal UI, clear distance feedback, and satisfying haptic responses reinforce player actions without visual clutter.
Results
Awards & Recognition
- 🏆 Judges’ Choice Award – Meta Horizon Creator Competition: Mobile Genre Showdown – Reloaded
Player & Engagement Impact
- Instant understanding of gameplay within seconds of launch.
- Strong replay behaviour driven by short runs and competitive distance chasing.
- Positive feedback on responsiveness, clarity, and the “one more try” loop.
Technical Wins
- Consistent performance in a live multiplayer, portrait-mode 3D game.
- Successful deployment of a fully GenAI-generated production pipeline.
- Reusable procedural and camera systems applicable to future Byten21 projects.
Why It Matters
Oopsie Jumpsie demonstrates Byten21’s ability to:
- Rapidly prototype and ship award-winning mobile games on emerging UGC platforms.
- Combine GenAI-driven production with deliberate art direction and technical control.
- Design social, competitive experiences that are fun immediately and replayable by design.
For partners and platforms, it proves we can explore new production technologies without compromising player experience, performance, or polish.
About Byten21
Byten21 is a London-based creative production studio building games and interactive experiences on UGC platforms including Meta Horizon Worlds, Roblox, TikTok, and Snapchat.
We specialise in mobile-first multiplayer games, GenAI-assisted production pipelines, and performance-optimised interactive worlds designed for social play and global audiences.
Looking to build a game or interactive experience on UGC platforms?
Let’s talk.