World of Goo is a 2008 puzzle strategy game developed and published by 2D Boy. In this game, players can build lots of different types of goo to the pipe in order to complete the level, and solve the puzzle in order to go to the next level. As the player progresses through the game, they can find new types of goo. There is also an OCD achievement in which if the player does the requirement to get OCD, a flag will pop up if they do the requirement.


World of Goo game cover.

World of Goo

A screenshot of the game, with the Goo Balls entering the pipe.