World of Goo/Ball Types

There are many types of goo balls in the game and each of them have unique abilities. The player needs to exploit their combinations in order to complete each of the levels. Some of the ordinary balls have no special abilities, and permanently attach themselves to the structure. While part of the structure, they cannot be used elsewhere nor they can reach the pipe to be rescued.

A permanently attached goo ball can separate from the structure if it touches a non-lethal side, however, this more commonly produces a structure that buckled under its own weight rather than being a useful trick.