The Water Balloon (ウォーター バルーン U~ōtā barūn?) is an object that appears in Sonic Boom: Rise of Lyric. It is a simple water balloon that can short-circuit electronics and is one of the weapons that can be used against enemies in gameplay.
As its name implies, the Water Balloon is a simple, but huge blue balloon filled with water. At first glance it seems like a primitive weapon, but its qualities are invaluable against Destruction Troops which short-circuit when poured with water. As such, it is a weapon that these robots fear more than anything.