Lines to Fill is a thinking game where you draw lines to complete the given puzzle shape. Simply drag one of the colorful blocks using your finger or the left mouse button, and make sure there are no blank spots left. Since the game has no time limits and no way to lose, you can enjoy this stress-free experience complete with hundreds of unique levels on your computer or mobile device. Can you block out some time and finish every level?

You see a puzzle “shape” made up of empty (blank) spots.
At the bottom (or somewhere), there are colorful blocks (pieces), each made of line-segments or shapes.
You drag a block using your finger (touch screen) or with mouse (click & drag)
You place it into the puzzle shape so that it fits — you want to fill all blank spots, leaving no gaps.
There is no time limit, and there’s no losing condition — you just progress by completing levels.