World of Goo

World of Goo is one of those games that seem to be easy to play, but they are really difficult to master. First levels are easy, they are good to get used to the way you have to play, but as long as you pass levels, they get harder and harder and it's really challenging. The main objective of the game is to get a requisite number of goo balls to a pipe representing the exit. In order to do so,...