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"Happy Filled Glass 4" is a challenging and engaging coloring game that requires strategic thinking. Your goal is to draw lines to guide the flow of water into the glass, ensuring it reaches full capacity. The objective is to achieve this with the least amount of line work possible, as this will earn you more stars at the end of each level.

This game consists of 100 unique levels, each presenting its own set of intricate puzzles and obstacles. You may need to maneuver around sponges, utilize mills, or navigate through trapdoors to direct the water flow effectively.

Should you find yourself in need of assistance, the game offers a "hint" feature, symbolized by a light bulb. This can provide guidance on where to draw your lines for optimal results. Enjoy the satisfaction of making the drinking cup "happy" by filling it with water through your strategic line drawing.