Monument Valley from ustwo games turned impossible geometry into a meditative puzzle experience on mobile. You guide the silent princess Ida through optical illusions, rotating towers and sliding platforms to create paths that should not exist. The game proved that mobile could be a home for genuine artistry, not just free-to-play grinds. Its visual design drew from M.C. Escher, Japanese woodblock prints, and minimalist architecture. Short but profoundly memorable, it changed how people thought about what a phone game could be.