Swatch

Each round shows five colors, one at a time. You get five seconds to look at a color, and one look only: reloading the page does not bring it back.

Then the color is gone and three sliders take its place: hue, saturation and brightness. Drag them until the panel is the color you remember, and lock it in. On a keyboard, Tab moves between the sliders and the arrow keys move one. Hold Shift to move ten at a time.

Your color is set beside the real one and scored by how alike the two look to the eye, not by how close the numbers are. A match is worth 100, a near miss about 85, and a blind guess under half. Five colors make a round of up to 500. Everyone gets the same five, and a new round arrives at midnight. Among players with the same points, the faster round is ahead.