A 5×5 working-memory puzzle with two modes you won't find in any off-the-shelf Simon Says clone. Watch the pattern, then reproduce it before it fades.
Each round, the game lights up a sequence of cells on a 5×5 board. Your job is to reproduce that sequence by tapping the cells in the same order. Get it right and the chain grows by one. Get it wrong and the round ends.
The sequence isn't random — it travels as a diagonal wave from one corner to another. You have to reproduce the wave in the same direction. This trains spatial-sequence memory, not just item memory.
After the sequence plays, every cell fades through three brightness levels (full → mid → faint) and then disappears. You must reproduce the order in which cells faded, including remembering which cells were dimmer than others.
Anyone who wants a quiet, browser-based working-memory workout with no streak-pushing, no notifications, and no "come back tomorrow" pressure. It is also used by some teachers and parents as a calm between-task exercise for older children — though it's not specifically designed for kids and contains no kid-targeted content.
Echo Grid started as an attempt to answer a simple question: why do all "memory" games look the same? The standard answer — four colored buttons lighting up — is so universal that it has become invisible. We wanted to make something where the mechanics themselves force a different cognitive demand.
Cascade mode came from watching people fail at traditional memory games not because they forgot items, but because they couldn't track order across a long list. Constraining the pattern to a diagonal wave turns "remember 7 items" into "track a direction" — which is a different mental task and, for many players, easier despite being shorter.
Echo Decay came from observing that real-world memory isn't binary. You don't remember "yes/no" — you remember "vividly / vaguely / almost". Echo Decay forces that graded recall by adding a brightness dimension to the sequence.
Neither of these modes exists in any mainstream memory-game app we could find. If you've seen something similar elsewhere, please tell us — we'd love to credit the original.
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Echo Grid is a casual puzzle game for entertainment and informal cognitive exercise. It is not a clinical tool and does not diagnose, treat, or prevent any medical or psychological condition. If you have concerns about your memory or cognitive health, please consult a qualified clinician.
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