In some versions, new images fade in as you click old ones. Learn the timing so you can click the next set before they are fully opaque.
Much like competitive gaming, a high-refresh-rate monitor and a responsive mouse can shave milliseconds off your response time. The Cultural Impact Infinite Captcha Game
There is a certain dark humor in spending hours proving you are human to a machine that won't let you stop. Strategies for High Scores In some versions, new images fade in as you click old ones