Syger

Syger is the miniboss of Unicorn's Cave in The Legend of Zelda: Oracle of Seasons, being an enormous resembling a modern  capable of rolling into a ball. When rolling, it can bounce diagonally or curvingly around the walls, charge up several successive vertical dashs, or move outwards around the room in a rectangular spiral. To damage it, Link must strike the small red ball on the end of its tail when it is uncurled. As it takes damage, it gets more quick and erratic, though it has low attack power despite its size.