UNION JUMPERS!

A two-handed puzzle action game where you control two characters simultaneously with your left and right hands.

Created for Ebitengine Game Jam 2025.

🎮 Play Online

• Play UNION JUMPERS! on GitHub Pages
• Play UNION JUMPERS! on itch.io

📖 About the Game

UNION JUMPERS! is a cooperative puzzle platformer where players must guide two characters (blue and red) to the goal simultaneously. The unique twist is that each character is controlled by a different hand - creating a challenging coordination experience.

Features

• Dual Character Control: Control blue character with left hand (F key) and red character with right hand (J key)
• 10 Stages: Progressively challenging levels from tutorial to expert
• Stage Gimmicks:
  • Spikes (red triangles) - instant game over on contact
  • Speed-up platforms (green) - increases movement speed
  • Speed-down platforms (orange) - decreases movement speed
• Cross-Platform: Works on PC browsers and mobile devices

Controls

PC (Keyboard):

• F key: Jump (Blue character / Left hand)
• J key: Jump (Red character / Right hand)
• Space: Retry/Next stage

Mobile/Tablet:

• Tap left half of screen: Jump (Blue character)
• Tap right half of screen: Jump (Red character)

🛠️ Development

Prerequisites

• Go 1.24 or later

Building

# Build for WebAssembly
make build-wasm

# Run local development server (port 8080)
make serve-wasm

📁 Project Structure

egj2025/
├── main.go              # Main game logic
├── sound.go             # Sound system
├── assets.go            # Embedded assets
├── stage_loader.go      # Stage management
├── stage*.go            # Generated stage data
├── stage*.txt           # Stage definitions (40x31 ASCII grid)
├── assets/              # Game assets (images, sounds)
├── web/                 # Web files for WASM build
└── cmd/stagegen/        # Stage generation tool

🎵 Credits

Development

• Author: pankona
• AI Assistant: Claude (Code assistance)

Assets

• Sound Effects:
  • Springin' Sound Stock
  • ポケットサウンド
  • 魔王魂
  • 効果音ラボ
  • Howling-Indicator
• Font: M+ Font (embedded in Ebitengine)

📝 License

MIT

🙏 Acknowledgments

Special thanks to:

• Ebitengine community for the awesome game engine
• Ebitengine Game Jam 2025 organizers
• All playtesters and feedback providers