Meh, it's bad. It only has fixed set of colors to choose from, and the only enemy here isn't the color, but the bar selector. Every color is fixed to -0, and doesn't make it random enough for that to be challenging. If I would to improve this "game" I'd made the HLS fully, making the "expert mode" where you also choose the luminance (aka how bright or dark it is). Make so that any number from 0-360 could appear, and so you could write the number down, not fiddle with the cringe bar, as it makes it clunky for precise choosing.