"Verlet Voyage" is a children's digital game that blends a fully custom-built Verlet physics simulation with a bespoke collision system and a stylized 3D-to-2D visual design. Players guide an orange ball, Golf, on a whimsical journey to rescue his friend, Orb, navigating a world where every stretch, collision, and deformation emerges from finely tuned, original physics code.Designed specifically for children's intuitive interaction, the game leverages affordance: visual and physical cues naturally suggest possibilities without explicit instruction. The custom simulation empowers players to experiment, strategize, and discover through responsive, emergent behavior.By combining handcrafted physics systems with narrative warmth, Verlet Voyage explores how deep technical design and playful aesthetics can enhance agency and creativity for young audiences.