What's the cognitive limit?

Miller's classic finding: working memory holds 7±2 items (5-9 for most people). Most untrained adults stall at round 8-12 in Simon. Chunking strategies (grouping into pairs/triples) effectively expand the limit by storing chunk-patterns instead of individual items — that's how memory athletes reach round 20+.

Does practice make me better at memory in general?

Mixed evidence. Research on brain-training games (Lumosity, Cogmed, etc.) generally shows you get better at the specific game with practice, with limited transfer to other memory tasks. For broad cognitive benefit, mix activities: physical exercise (large effect), language learning, social engagement, novel skill acquisition.

Why does my best round vary so much day-to-day?

Working memory is sensitive to sleep, stress, hydration, caffeine timing, and time of day. Most people peak mid-morning and dip mid-afternoon. A bad night's sleep can drop your max round by 3-5. Use the daily variation as a rough indicator of cognitive state, not a fixed score.

What was the original Simon toy?

An electronic memory game launched by Milton Bradley in 1978, designed by Ralph Baer (also the inventor of the Magnavox Odyssey, the first home video-game console). It was a circular plastic toy with 4 colored buttons, each playing a distinct tone when pressed. The mechanic — listen to a sequence and repeat it — was directly inspired by the Atari arcade game Touch Me (1974). Simon became one of the best-selling toys of the late 1970s.

Can I disable the sound?

Mute your device or browser tab. The colors and timing are sufficient to play silently — the tones are nice but not strictly necessary for memory recall.

Why does the sequence add ONE color per round, not double or grow exponentially?

Because the original Simon worked that way and convention sticks. Linear growth (round n has n colors) gives a clean curve where reaching round 20 feels meaningfully harder than round 10. Doubling or exponential growth would be impossible to play past round 5.

Games · Free tool

Simon Says

Memorize and repeat color sequences. Each round adds one color. Best round saves.

Updated June 2026

Round

Best: 0

Watch the colors light up, then repeat the sequence in order. Each round adds one color. Most adults make it to round 8-12; champions push past 20.

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What it does

Memorize and repeat color sequences. The classic Simon memory game: 4 colored panels (red, yellow, green, blue), each with a distinct tone. The game plays a sequence of panels lighting up in order; you click them back in the same order. Each round adds one more color to the sequence. Game ends on first wrong press. Best round persists in your browser.

The original electronic Simon was launched in 1978 by Milton Bradley (designed by Ralph Baer of Magnavox- Odyssey fame) and became one of the best-selling toys of the late 1970s. The mechanic — increasingly long sequences — taps directly into short-term / working memory, the mental scratchpad psychologists since the 1950s (originally Miller’s 1956 paper The Magical Number Seven, Plus or Minus Two) have studied as the rough capacity limit of conscious recall.

Most untrained adults stall at round 8-12. With deliberate practice and chunking strategies (grouping colors into pairs or triples and remembering the patterns of pairs rather than individual colors), people can reach round 20+. Children typically reach 5-7; memory peaks in early adulthood and declines slowly with age but stays meaningful into 60s-70s. Use this as a quick working-memory check or training drill.

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How to use it

Press Start. The game plays a single color for round 1.
Click that color back. Round 2 plays a 2-color sequence; click those back in order. And so on.
Each round adds one more color to the sequence — the first n-1 colors are always the same as the previous round, plus one new color at the end.
Game ends on the first wrong press. Best round (highest sequence completed) saves to browser local storage.
Chunking strategy: group the sequence into pairs or triples ("red-yellow, then green-green-blue, then…"). Easier to remember than a flat list.

When to use this tool

Quick working-memory exercise — 1-2 minutes per game.
Tracking your memory performance over time (test daily, watch for trends with sleep/stress changes).
Educational use teaching kids about memory and patterns.
Casual challenge with a friend — race to the highest round.

When not to use it

Clinical memory assessment — not a diagnostic tool. For real cognitive testing use validated instruments (MMSE, MoCA) administered by a clinician.
Memory training over months — the research on whether brain-training games transfer to real-world memory benefit is mixed; the consensus is they make you better at the specific game, with limited generalization.
When you want a chill game — Simon is intense. Pick a slower game (memory-game pair-matching, 2048) for a calmer break.

Common use cases

Quick use during a typical workday
Pre-decision sanity-check on inputs and outputs
Educational use — demonstrating the underlying concept
Onboarding a colleague who needs the same calculation/conversion

Frequently asked questions

What's the cognitive limit?: Miller's classic finding: working memory holds 7±2 items (5-9 for most people). Most untrained adults stall at round 8-12 in Simon. Chunking strategies (grouping into pairs/triples) effectively expand the limit by storing chunk-patterns instead of individual items — that's how memory athletes reach round 20+.
Does practice make me better at memory in general?: Mixed evidence. Research on brain-training games (Lumosity, Cogmed, etc.) generally shows you get better at the specific game with practice, with limited transfer to other memory tasks. For broad cognitive benefit, mix activities: physical exercise (large effect), language learning, social engagement, novel skill acquisition.
Why does my best round vary so much day-to-day?: Working memory is sensitive to sleep, stress, hydration, caffeine timing, and time of day. Most people peak mid-morning and dip mid-afternoon. A bad night's sleep can drop your max round by 3-5. Use the daily variation as a rough indicator of cognitive state, not a fixed score.
What was the original Simon toy?: An electronic memory game launched by Milton Bradley in 1978, designed by Ralph Baer (also the inventor of the Magnavox Odyssey, the first home video-game console). It was a circular plastic toy with 4 colored buttons, each playing a distinct tone when pressed. The mechanic — listen to a sequence and repeat it — was directly inspired by the Atari arcade game Touch Me (1974). Simon became one of the best-selling toys of the late 1970s.
Can I disable the sound?: Mute your device or browser tab. The colors and timing are sufficient to play silently — the tones are nice but not strictly necessary for memory recall.
Why does the sequence add ONE color per round, not double or grow exponentially?: Because the original Simon worked that way and convention sticks. Linear growth (round n has n colors) gives a clean curve where reaching round 20 feels meaningfully harder than round 10. Doubling or exponential growth would be impossible to play past round 5.

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