As villains from another dimension are attacking you, you need to bring forth other Gumballs from other universes, merging two of the same kind together to level up to a better one and do so until you get powerful units. Use them to automatically attack your foes, and defeat them until you also take down the boss of a wave. Each new one is stronger than the last, and to speed up the spawning of Gumballs, keep clicking on the remote icon.