You can download it for the temporary discount price of just 69p / 99c on the App Store.
The goal of Shades is to stack blocks of color to form new shades of that color, and combine rows of the same shade to clear them out.
You do this by guiding falling blocks of color with simple swipes, finding the right column to drop them into, or letting them fall into place on their own.
If you don't act quick to combine the right colors, you'll soon find yourself with a checkered grid of mismatched shades.
Watch the gameplay trailer below for a better look, or buy Shades for yourself on the App Store.