About PlayMemorize Illusions

PlayMemorize Illusions is a free perception trainer built around fifty-seven classical optical illusions. Every round draws one scene · a Müller-Lyer line pair, an Adelson checker-shadow, a Café wall, a Kanizsa triangle, a Penrose staircase · and asks a single, grounded question. Which line is longer? Which patch is lighter? Are those lines really parallel? Your eyes lie; the SVG coordinates don't.

Four families, fifty-seven illusions. Size (Müller-Lyer, Ebbinghaus, Ponzo, Jastrow, Delbœuf, Sander, vertical-horizontal, Oppel-Kundt, Shepard tables, Helmholtz squares, Baldwin), colour and brightness (Adelson checker-shadow, Simultaneous contrast, White's, Cornsweet, Koffka ring, Chubb, Bénary cross, Mach bands, dungeon, Kanizsa triangle/square, Ehrenstein disc, abutting gratings, neon spread, watercolour, Asahi, Munker-White, Bezold, Todorović, and the ambiguous/impossible/animated set · Rubin vase, Necker cube, Schröder stairs, bulging checker, Penrose triangle/stairs, devil's tuning fork, impossible trident, Freemish crate, lilac chaser, rotating snakes, stepping feet, motion-induced blindness), orientation and continuation (Café wall, Zöllner, Poggendorff, Hering, Wundt, Orbison, Ehrenstein line, Fraser spiral, twisted-cord, Bourdon, Ouchi) and grid after-effects (Hermann, Scintillating, Extinction). Use the category chip row to drill one family at a time.

Deterministic by construction. Every illusion is a pure function of (category, difficulty, seed) · equal-length lines are pixel-equal, identical greys are RGB-equal, parallel lines are truly parallel. After you answer, a reveal overlay shows the actual geometry and a one-line explanation of why the perception fails, so each round is a tiny lesson in how vision works.

Part of the PlayMemorize family of free brain-training games. Runs entirely in your browser, works offline as a Progressive Web App.

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