Afterimage

Afterimage is a colour memory test on Bludle, a site of free browser games. It plays in any modern browser with nothing to download and no account to make.

A day's game is five rounds. In each one a single colour fills the screen for a few seconds, with its values hidden. Then it disappears, and in later rounds a burst of other colours flickers past before you are allowed to answer. Finally you get a grey swatch and three sliders for red, green and blue, with no time limit, and you mix the shade you think you saw. Revealing the match puts the target and your answer side by side with the exact values and the difference in each channel.

The first round gives you five seconds to look and no interruption. Each round after it takes half a second off the study time and makes the interruption longer, so the fifth colour is the hardest to keep. Your accuracy for each round and your average for the day are kept, along with days played, your best day and a streak.

Most daily colour games ask you to match a colour you can still see, or to guess a hex code. Afterimage takes the reference away, so what it tests is how well you hold a shade in mind, and how its warmth and brightness drift once it is gone. It suits anyone who liked Dialed's colour game and wants a short, five-colour version once a day.