Happy Glass Game

Happy Glass is a physics puzzle where every level gives you the same simple tool: draw a line. Water pours from a fixed spigot, and your job is to sketch a path with the mouse or your finger that redirects the flow into a glass sitting somewhere else on the screen, often behind ramps, spinning blades, trapdoors or obstacles that block the straight route.

The challenge isn't finding a way to fill the glass — there's almost always an obvious one. It's finding the leanest way to do it. Each level scores you on how little you drew: use fewer, more efficient lines and you earn more stars, which is what pushes you back to a level you "solved" to try it again with a cleaner solution.

Controls

Click and hold the mouse button, then drag to draw a line; release to let it become a solid surface. On phones and tablets, the same motion works with a finger. There's no keyboard input — every level is played entirely with a pointer or touch.

Tips

• Draw short, angled lines instead of long ones — a single steep line often redirects water just as well as a longer flat one, and it costs less on the star count.
• Watch where the water actually lands before drawing your next line; a splash spreading past the glass usually means the previous line needs a steeper angle, not a longer one.
• If an obstacle looks pointless, try ignoring it — later levels reuse mechanics that only start to matter once you're used to seeing them.

It's a pick-up-and-play game suited to short bursts — a level takes seconds to attempt, and the pull to reduce your line count to get that third star is what keeps a session going longer than planned.