Mario will send out Snapjaws, swooping purple birds, and electric sparks in an attempt to stop Junior. Junior can defend himself by dropping fruit found around the levels on the heads of his foes. The more foes a piece of fruit hits in a falling sequence, the higher bonus points can be scored.
Junior can also avoid enemies more easily by grabbing hold of two chains or vines at a time to climb away faster, or by jumping over his foes. However, any long fall or falling into the water on certain levels will mean the loss of a life for Junior.