Filled Glass 3 is a drawing puzzle: liquid pours from somewhere in the level and you draw lines that redirect it into a glass. Your lines are solid objects with weight, so they can also tip, fall and block.
Ink is limited and the star rating depends on how little you use, so the puzzle is finding the shortest line that works rather than building an elaborate chute.
Use as little ink as possible. The rating is based on how much you draw, so a single short well-placed line beats a long chute that also works.
Yes — they're solid objects with weight, so they can tip over or be knocked by the liquid, which is part of several puzzles.
Yes — draw with your finger. Nothing to install.