About the game
Happy Glass: Draw to Fill is a drawing puzzle about getting water into a glass. A dashed line on the glass marks how high the water needs to rise, and the glass stays flat-faced until it gets there.
Each attempt puts water somewhere on the screen and leaves the glass empty. You sketch with a finger or the mouse, and every stroke becomes a solid line the water can slide down, bounce off or get blocked by. Waste too much of the flow and the try ends, so angle matters as much as shape. A bad sketch costs nothing but a redraw.