Here's the deal: you are the mushroom and must draw 1 continuous path that will cover every square. The last square must land on a water drop. I downloaded the Lite version & solved all 10 levels. They're good! However, I'm in the middle of a similar game: Number Painting, which is more epic/insane with 500 levels.
https://itunes.apple.com/us/app/scribologic-lite-logical-thinking/id929070462?mt=8 This is the Lite version.