Stone Skip Go

Spatial 3D lake, 5 stone types, power+angle physics. 100% offline, zero permissions. 60 fps.

Stone Skip is a precision physics simulation built on a Spatial 3D lake environment.

PHYSICS ENGINE

• Dual-input control: independent power and angle sliders
• Sweet-spot mechanics: ~15-degree angle bonus coefficient for peak performance
• Per-stone skip coefficients: 5 stone types with distinct trajectory characteristics
• Random variance system: adds natural feel to each throw

VISUAL SYSTEM

• 2.5D Spatial 3D rendering: sky-to-water dual gradient with atmospheric depth
• Dynamic ripple animation: Circle stroke scale-expand with 1.2s fade simulation
• Moon glow and distant shore silhouettes for environmental depth
• StoneShape 3D pseudo-perspective: side face, top face, specular highlight

PROGRESSION

• 5 collectible stone types: Pebble, Slate, Granite, Jade, Obsidian
• Unlock thresholds: 4, 7, 10, 14 skips for each progressive unlock
• Historical data: last 30 throws stored as JSON via UserDefaults
• Real-time HUD: skip counter and power metrics during flight

PLATFORM

• iOS 17+ / iPhone only / portrait
• 100% offline: zero network, zero account, zero permissions
• Bilingual: English and Simplified Chinese
• Haptic: 3-tier feedback (light per skip, success, error)