First Android App I've published. The goal is to create a perfect gradient. Circle markers are the starting points (they are correct). As soon as you drag a square to their correct position, a rectangle marker is placed showing that it's correct. If you need help, there's a Hint option in the Menu. Looking forward to hearing your feedback!
I enjoy playing it.
Pros:Simple, easy, quick puzzle game, and good color perception training.
Cons:Could use bigger challenges and possibilities to tweak some settings.