Pro Watermelon Spitter unlocked! Pro Upgrade - Gobstuffer! Spitter Agent eats twice as fast, doubling his seed attack frequency, and every second shot is a whole watermelon that can pop lead and frozen bloons. The next Watermelon Spitter you place will have this upgrade.
It allows the Watermelon Spitter to shoot a whole watermelon every second shot that can pop Frozen Bloons and Lead Bloons. It also makes the interval between eating and shooting much less frequent, highly increasing attack speed.