Oopsie Jumpsie: Multiplayer

🧠 Inspiration

Oopsie Jumpsie began with a simple goal: to get players having fun together within seconds, while exploring whether a complete game could be built entirely from 3D models generated using Horizon Worlds’ built-in GenAI.

Our team joined MHCP in 2025 and first met at the Meta Horizon Creator Summit in San Francisco, which quickly led to a collaboration focused on creating something simple, joyful, and social - an experience anyone can pick up instantly.

At its heart, the loop is beautifully straightforward:
jump → dodge → survive → retry — and try to get further than your friends.

🛠️ How We Built It

From load to gameplay in under three seconds, Oopsie Jumpsie is designed for native-portrait mobile play, with intuitive tap + swipe controls. Runs are fast; the speed increases as you progress, adding excitement and mastery.

A custom fragment-spawning system generates a fresh layout every time. The world is fully multiplayer, letting players run side-by-side and compare distance live, supported by personal and global rankings.

Every 3D model, SFX, and ambience was created using Meta GenAI, including Mesh/Environment generation, Texture generation, Audio generation, plus Creator Assistant.
We also used the Camera API to create a clean vertical view, with mobile-first UI and satisfying haptic feedback.

🚧 Challenges

• Making layouts feel fresh yet fair at rising speeds
  
• Building a consistent world using only GenAI assets

🏆 Accomplishments

• ✅ 100% GenAI 3D models + audio
  
• ✅ Portrait-mode 3D Horizon Worlds game
• ✅ Multiplayer: race to get further
  
• ✅ <3s onboarding
  
• ✅ Procedural fragment-spawning
  
• ✅ Camera API + haptics
  

🚀 Next Steps

• 🌈 Seasonal themes
  
• 🧢 Unlockable cosmetics
  
• 🎯 Daily challenges
  
• 🌀 New biome fragment sets

Built With

• horizon-worlds
• meta-ai
• typescript