These are Dart Monkey's Alternate Upgrades. The Dart Monkey is a weak monkey at first, but it will get stronger thanks to those special upgrades. Alternate Upgrades are upgrades that focus on other towers or projectiles instead of focusing in the main tower such as a Bomb Tower with a Ninja Alternate Upgrade. Not all towers have the same paths for Alternate Upgrades. For example, a Ninja Monkey can't have a Village Alternate Upgrade. The Dart Monkey has 4 types of Alternate Upgrades: Tack, Ninja, Bomb and Dartling Alternate Upgrades. After this segment, I will be referring Alternate Upgrades as AU. Let's get this started.