Happy Glass Online is an online HTML5 game and 78.17% of 111 players like the game. The glass was sad because it was empty. All you have to do is draw a line to fill the glass with liquid balls. Try to find the best way to accomplish each level. You can come up with your own solutions and ideas. It's easy to get three stars on some levels, but then the difficulty of the level increases gradually can you still get them all?