Immobile Black Goo is a species of Goo in the video game World of Goo. They appear in a few levels, like Beauty School and Welcoming Unit. They are always found built together at the start of a level. Other types of Goo cannot climb on them. However, in certain levels like Welcoming Unit, they can be broken apart using gears and collected in normal pipes, a necessary action if you are shooting for OCD. When they're broken up, they behave identically to Dark Black Goo , except they move a bit slower. Their maximum number of attachments is unknown, but it is most likely 2, as no larger number has been seen in the game.