A guide to gaining Ninja Kiwi achievements in “Bloons Tower Defense 5” is located on the website GameMelon.com. It has a complete break down of each item and tower. The guide also explains the upgrades for each tower.
When playing “Bloons Tower Defense 5,” players see an assortment of towers on the right side of the screen that they can use, according to Game Melon. A number of these towers display a “?” on top of them. Players unlock them as they gain experience points, which are referred to as XP in the game. At the bottom of the screen is a bar that displays special agents that the player purchases with monkey money.