Flat-colored 3D models in mobile games often look blocky because they use fewer polygons to fit mobile devices’ limited processing power.
Lower polygon counts (the tiny shapes that build 3D models) help games run smoothly on phones/tablets, but fewer polygons create jagged edges. Flat colors—without textures or shading to blur lines—make this blockiness more obvious since there’s no detail to hide rough shapes.
To reduce blockiness, try adding subtle texture details or soft gradients to flat colors; this softens edges while keeping the model lightweight for mobile.