Main features: physics-based puzzle gameplay where sand blocks flow naturally, fill gaps, and trigger chain reactions when lines are completed. Target users: all ages (children to adults), physics game enthusiasts, competitive community players. Core advantages: realistic sand-flow physics engine, strategic depth with visual appeal, free core experience (optional cosmetic upgrades), educational physics concepts. Typical workflow: place blocks → observe sand flow → create combos. Pricing model: free-to-play with optional cosmetic upgrades.