I Love Hue:

I Love Hue is a gentle journey into colour and perception. Arrange mosaics of coloured tiles into perfectly ordered spectrums. Lovingly made for players who enjoy beautifully crafted puzzle games - or anyone who needs a few moments of visual tranquility.

I love this game. It’s especially great when I just want to zone out for a bit. You’re given a grid of shapes with a color gradient spread across them. Then they get mixed up and you have to put them back in order. It’s not especially hard, but while you’re doing it you’ll feel a modest peace.