Visual filtering and selective attention. Find the subtly different target among distracting circles.
Click the target (a polygon slightly different from a circle). Distractors are circles of the same color. The task lasts 30 seconds. After each click, the layout changes.
Press Start. Then click the target as fast as you can.
Easy uses fewer distractors and a clearer target. Normal adds more distractors and a more circle-like target. Hard increases clutter further and adds slow motion, which makes filtering and tracking harder.
At higher difficulty the target is more circle-like. Use a brief confirmation glance before you click.
Input latency, screen size, and pointer precision affect both speed and accuracy.
Hits drive points the most, but misses reduce your score. Aim for clean hits first, then push speed.