Physics-based motorcycle trial game inspired by the classic J2ME mobile game from 2004
Navigate rough terrain, pull off wheelies and stoppies, reach the finish line without crashing
More screenshots
| Key | Action |
|---|---|
| W | Accelerate |
| S | Brake |
| A | Lean back (wheelie) |
| D | Lean forward (stoppie) |
| Scroll | Zoom in/out |
| RMB drag | Rotate camera (voxel mode) |
| G | Toggle ghost |
| F1 | Toggle sprites |
| F2 | Switch render mode |
| Escape | Pause / menu |
Physics
- Soft body simulation, 6 mass points connected by springs
- Wheel rotation with friction and slip
- Ground collision with proper normal response
- Crash detection based on bike angle and head impact
- Rider ragdoll on crash
Terrain
- Procedural generation using layered noise
- Macro shape for overall track flow, plus medium and micro detail
- Safe zones near start and finish for playability
Visuals
- Multiple color themes with custom sky palettes, stars and sun
- Vector graphics and sprite rendering
- Voxel style 3D render mode
Gameplay
- 10 procedurally generated levels
- 3 bike types with unique handling
- Ghost replay of your best run per level
- Time tracking per level
- Settings saved between sessions
The game includes multiple visual themes. Each theme defines:
- Background and terrain colors
- Sky gradient palette
- Optional stars and sun
- Bike color scheme
Themes are configured in Content/Data/World.json and can be easily extended
Requirements
- .NET 8.0 SDK
Steps
git clone https://github.com/yourusername/GravityDefiedGame.git
cd GravityDefiedGame
dotnet build
dotnet runPhysics Model
The bike uses a soft-body approach with 6 connected points
Springs connect all points with configurable stiffness and damping. Wheels have angular velocity affected by ground contact, engine torque, and braking
Terrain Generation
Levels are built in layers:
- Control points create the macro track shape
- Domain warping breaks obvious patterns
- Medium noise adds bumps
- Micro noise adds surface texture
- Constraints ensure playability
Planned Features
- Level Editor Create and share custom tracks with drag-and-drop terrain tools, adjustable difficulty, and export/import functionality
- Leaderboards Local and online best times for each level, personal records tracking, daily/weekly challenges
- Sound & Music Engine sounds reactive to throttle, crash effects, ambient music
- Mobile Support Touch controls with on-screen buttons, tilt-to-lean option
- Achievements Unlock badges for completing levels, performing stunts, reaching speed milestones
- More Bikes Additional bike types with unique physics, visual customization options
- Track Packs Themed level collections, community-created track sharing
- Multiplayer Split-screen local races, online time trials
- Replay System Save and watch full runs, export as video
Inspired by the original Gravity Defied, released for J2ME phones in 2004
MIT