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A solitaire that didn't exist before Sergiy Osadchiy invented it, and it doesn't play like anything else in the genre.
The deck is forty-nine cards: seven back designs crossed with seven diamonds in the colours of the spectrum — red, orange, yellow, green, blue, indigo, violet. Matching works on either property. A card can move between columns if its background or its diamond matches the background or diamond of the card on top of the target column, which means every card gives you two possible routes and you will regularly take the wrong one.
Foundations are stricter: each pile holds a single background colour, and the diamonds must run in spectral order from red through to violet. Clear every card onto the foundations and you've won.
Difficulty changes the geometry rather than the odds. On easy there's an eighth column that takes any card to start and behaves normally after that. On medium it shrinks to a single-card cell. On hard it isn't there at all.
Bring your colour sense. And remember Roy G. Biv.
