Eikonal vs Prism

Eikonal is a physics-accurate optical puzzle game. Place and rotate mirrors, prisms, and lenses on a dark canvas, and watch real light rays bend, reflect, and split in real time. There is no submit button — the puzzle recognizes itself as solved the moment your ray field reaches every target. Named after the eikonal equation, the mathematical foundation of geometric optics, the game simulates light the way it actually behaves: angle of incidence equals angle of reflection, white light disperses into red, green, and blue through a prism, and lenses converge and diverge beams along their true paths. 100 PUZZLES ACROSS 5 CHAPTERS • Reflections — Mirrors. Bounce light to the target. • Refraction — Prisms. Split white light into its spectrum. • Convergence — Lenses. Focus and diverge beams. • Channels — Beam splitters and fiber. Guide multiple paths at once. • Caustics — Diffraction and curves. The master class. LIGHT THAT FEELS ALIVE Every move updates the entire ray field instantly. Nudge a mirror a degree and the whole scene of light shifts with it. The simulation runs continuously, so solving is a tactile, exploratory act — not a guess-and-check. DESIGNED FOR iPHONE AND iPAD Smooth, responsive ray tracing. Glowing beams against a near-black field. Built for iOS 17 and later, with full iPad support in every orientation. NO NOISE No ads. No in-app purchases. No accounts. No internet required. Just you, the light, and the puzzle. Solve with light.

One mirror setup. Two worlds of light. Prism is a light-routing puzzle about restoring small optical wonders. Rotate a mirror, switch between two light states, and find a single setup that makes both work. An adjustment that helps one route can break the other. The repair is complete only when both sets of targets are lit by the same mirror configuration. THE OPTICAL ATELIER Bring six pieces back to life: a lighthouse, a greenhouse, a constellation clock, a rain-streaked window, a film projector, and a deep-space relay. The first two pieces are completely free. Four more are included with Prism Pro, including existing members. There is no timer or attempt limit in the atelier. Hints are free and highlight a mirror without turning it for you. Repairs save on your device, and completed pieces can be revisited to explore both light states. HOW TO PLAY • Tap a mirror to rotate it. • Switch between A and B to inspect the two light states. • Every turn changes both states; align both to finish the repair. • Undo a turn or restart whenever you want. KEEP DISCOVERING • A fresh Daily Challenge every day. • 42 Journey levels across six optical worlds, with stars for solving within par. • An on-device Weekly Challenge with a personal best and a Monday reset. • Three rotating Daily Goals, streak milestones, and gameplay rewards. • Monthly on-device seasons have a fixed goal of 15 Daily Challenge completions. Reaching it records a cosmetic collection frame; Prism Pro members also unlock the matching board aura. Every season reward has a fixed requirement and never uses a random draw. • Four Practice difficulties from Easy to Expert. • Fifteen Optics Lab experiments featuring prisms, beam splitters, teleporters, one-way gates, colored emitters, and additive color synthesis. • A Spectrum Archive of optical artifacts earned with Light Energy. • Prism Vault with 36 cosmetic auras across six optical series. Base odds are published; unowned items in the rolled rarity are selected first; duplicates become Prism Dust. After nine consecutive Common draws, the next is Rare or better; Legendary is guaranteed within thirty draws. • Clean image sharing after a solve. • Haptics, color labels, patterned beams, VoiceOver labels, and Reduce Motion support. • Traditional Chinese and English interfaces. • No ads or cross-app tracking. No account is required. Puzzle progress and collection state stay on your device. PRISM PRO Includes all six Optical Atelier pieces, the complete Journey and Spectrum Archive, unlimited Practice puzzles and hints, the complete Daily Challenge archive, every visual theme, detailed stats, one automatic bonus Light Ticket each day, and expanded streak protection. Prism Pro is available as a monthly or yearly auto-renewable subscription, or a one-time Lifetime unlock. Free players keep both complete atelier pieces, the Daily Challenge, limited Practice puzzles and hints, the first Journey world, and gameplay-earned Light Tickets. Light Tickets cannot be purchased or traded. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://antonio1228.github.io/prism/privacy