The player must exploit combinations of these goo balls in order to complete each level. There are several types of goo balls in the game, each of which has unique properties. In order to do so, the player must use the goo balls to construct bridges, towers, and other structures to overcome gravity and various terrain difficulties such as chasms, hills, spikes, windmills, or cliffs. The main objective of the game is to get a requisite number of goo balls to a pipe designed to represent the exit. Players from all over the world can compete, as the height of the tower and number of goo balls used are being constantly uploaded to the 2D Boy server. There is also a bonus meta-game called World of Goo Corporation, where the objective is to build the highest tower using goo balls which the player collected through the course of the game. Each level has its own graphic and musical theme, giving it unique atmosphere. The game is divided into five chapters, each containing several levels. The game is built around the idea of creating large structures using balls of goo.
Placing a goo ball to construct a bridge.
