Why HSB works for guessing
Hue chooses the color family, saturation controls intensity, and brightness controls lightness.
HSB color game
An HSB color game uses hue, saturation, and brightness instead of raw RGB values. Toon Tone uses HSB because it matches how people describe remembered colors.
Play Toon ToneHow to improve your score
Set hue first, reduce saturation more than you expect, then tune brightness.