PHOSPHOR — a letter-key quiz

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PHOSPHOR — a letter-key quiz

PHOSPHOR is a fast letter-key quiz arcade about computing history, styled as an amber CRT terminal. Answer with A/B/C/D (keys on desktop, big keycaps on mobile), race a 12-second timer for speed bonuses, and stack a streak multiplier up to ×5 — then get a canvas-rendered scorecard you can share, copy or download as a PNG.

Install web app

Open your browser menu and choose Install app or Add to Home Screen. If unavailable, bookmark this page.

Games need an internet connection.