Cannons are used only in Planetarium. As Tak proceeds, he must use two different cannons. Tak must turn the cannon power on to use cannons. Green Cannons shoot in a straight line,damage gunks,and destroys Power Parasites and their eggs. Pink Cannons is best effective for puzzle switches,shoots like an arc,and damage gunks and Power Parasites. In Tak: The Great Juju Challenge, cannons don't need to be powered and can be found through certain levels.