World of Goo

The story of the game is primarily told through cutscenes and signs scattered throughout various levels, which are attributed to an unseen character known as the Sign Painter.
In the beginning of the game, it is revealed that pipes have been appearing throughout the world, disturbing many Goo Balls in their natural habitats. Filled with a childlike sense of curiosity and naivety, they build themselves towards the pipes. Upon reaching the pipe entrance, the Goo Balls are sucked by the pipe system into the "World of Goo Corporation" main building where they are processed into many products. The excess Goo Balls are left outside the Corporation headquarters where they together begin to build a giant tower. At the end of the first chapter, some Goo Balls escape from a Corporation building by attaching themselves to eyeballs which have the ability to fly. The chapter ends with the Goo Balls "seeing far away new lands".
The second chapter takes place on an island where World of Goo Corporation is searching for a new power source, due to wind power not being sufficient anymore. However, the location and appearance of the power source was forgotten, because in the past, it stopped producing electricity. A new Goo Ball is introduced, which is ground up by the Corporation into a facial cream. Near the end of the chapter, the power plant, which looks like a giant woman, is discovered. It is revealed that for many years, its remarkably powerful "beauty juice" powered the world. Yet with age, her beauty and consequently her electric output began to die. However, once unrefined beauty goo is injected directly into her forehead by the player, her youthful beauty is restored. At the expense of her ability to move her face, the world is supplied with large amounts of power. With this newfound energy, a factory doing outsourced work for World of Goo Corporation opens in the south.
During the third chapter it is said that the factory is developing a mysterious "Product Z." It eventually turns out that the mysterious Product Z is actually the third dimension (Product Z is the Z axis in mathematics). After the launch of Product Z, the player is informed that they are "incompatible with the world" due to the game being made up of only two-dimensional graphics, and is instructed to contact tech support in the information superhighway.
In the fourth chapter the player sets out to find the mysterious "MOM" program in the information superhighway. Shortly after the beginning the Goo Balls find the object responsible for rendering all the graphics. After pumping many of their own kind into the object, the graphics rendering improves, creating a more realistic environment (and the Pixel Goo Balls). Near the end they encounter MOM, who turns out to be a spam bot. Hoping to convert the world back to 2D, the player tries to overload World of Goo Corporation by having MOM send every spam email ever sent to everyone at World of Goo Corporation. After the player ventures to the Recycle Bin and un-deletes all the spam email, World of Goo Corporation receives the mail and, unable to deal with so much spam, explodes, shutting down Product Z while creating a massive layer of smog, dust, smoke and debris that envelops the entire world.
In the final chapter, it is revealed that all Goo Balls, except "scientifically pure" ones, have been sucked away to the former site of World of Goo Corporation. The remaining Goo Balls decide to work their way up the world's tallest island to reach a site where the telescope is located. The final level of the game reveals that the Goo Balls are now completely extinct, all the remaining having been sucked away to the shattered remains of World of Goo Corporation and added to the tower, and the gigantic telescope at the site has been rendered useless as it cannot see past the layer of smog. The Sign Painter reveals in his final sign that he has now become the Telescope Operator. Some balloon-like fish in the sea connect to the telescope and lift it out of the ground, where it breaks through the layer of smog and sees the tower of goo that has been built at the former World of Goo Corporation Headquarters, which can also see past the smog. The telescope falls back to the ground before it could see what the Goo Balls were building towards. A final and last cutscene reveals their goal; the camera pans up into space to reveal that the Goo Balls that escaped at the end of Chapter 1 have managed to reach a far-off planet populated by Goo Balls.