Happy Filled Glass 4

Happy Filled Glass 4 is a puzzle video game and the fourth installment in the Happy Filled Glass series. The game presents a series of physics-based challenges centered on a single objective: directing a stream of water into a glass. Each level features a static glass positioned on a surface, a fixed water source, and a variety of obstacles, barriers, and interactive elements. The player must draw lines or shapes on the screen to guide the water flow, avoiding spillage and ensuring the glass is filled to a designated line. The game introduces new mechanics not present in earlier entries, including moving platforms, wind zones, temperature-sensitive elements that can freeze or boil water, and portals that teleport the liquid. Levels are arranged in a linear progression, with difficulty increasing through the introduction of more complex obstacle configurations and limited drawing resources. The game is available on mobile platforms and web browsers, utilizing touch or mouse input. It is developed by an independent studio and is classified as a casual puzzle game.

The player interacts with the game by drawing lines on the screen using a finger or mouse cursor. These drawn lines act as solid barriers that redirect, block, or channel the water. The water is released from a fixed pipe or source at the start of each level. The primary control is the drawing tool, which is activated by pressing and holding the input device on the screen and dragging to create a line. The line appears as a colored, semi-transparent barrier. The player can draw multiple lines, but each level imposes a limit on the total length of lines that can be drawn. Lines can be erased by tapping an eraser icon or by redrawing over them. The water flow is governed by a physics engine that simulates fluid dynamics, gravity, and collision. The player must observe the level layout, identify the path of least resistance, and draw barriers to create channels, funnels, or dams. Some levels include interactive objects such as fans that blow the water, heaters that cause evaporation, or freezers that create ice blocks. The player can activate these objects by tapping them. The level is completed when the water level in the glass reaches the fill line. Failure occurs if the water runs out, spills over the edge of the play area, or if the glass is knocked over. The game provides a restart button and a level select menu.