Simon Says is a colour-and-sound memory game, inspired by the 1978 electronic toy with four glowing, beeping panels. Each round adds one more flash to the sequence, and you play the whole thing back from memory. A round takes seconds, but the pattern soon outpaces most people: easy to start, hard to put down on Android, phone, or desktop. It is free, needs no app, no download, and no sign-up, runs offline, and saves your best round privately on your own device.
Repeating longer and longer sequences works your short-term memory and trains you to hold and replay an ordered list under pressure. Tying each pad to its own tone also sharpens auditory recall and concentration.
Working memorySequencingConcentrationAuditory recall
Built as a single HTML file, with no frameworks, no network calls, no tracking. Plain DOM and CSS, vanilla JavaScript, Web Audio for the pad tones (mutable), and your best round saved in localStorage. Fully offline, and drops into any page via <iframe>.