Watch the yellow dot, then track it as every dot mixes together. When they stop, tap the one you tracked. Wrong tap costs a life — you have 3.
Focus Lock is a free online attention game built on multiple object tracking, a classic cognitive-science test of sustained visual attention. One dot flashes briefly, then blends back into an identical swarm that drifts and bounces for several seconds. Losing your target for even a moment ends the streak, making this one of the hardest focus games you can play in a browser — no download required.