Every colour can be described by three dials: hue (which colour), saturation (how vivid), and lightness (how bright). Move the sliders and watch all three at once.
Reds, oranges, yellows. They advance — feel energetic, close, cosy. KullGames gold lives here.
Blues, greens, violets. They recede — feel calm, distant, serious. KullGames indigo lives here.
Position around the wheel, 0–360°. Red 0, green 120, blue 240.
Grey at 0%, full intensity at 100%. Lower it for calm, muted palettes.
Black at 0%, white at 100%. The middle is where colour is most vivid.
Rule of thumb: pick one hue you love, then build a palette by changing only saturation and lightness. It's almost impossible to make that look bad.
Further reading — the science behind the dials