The Impoppable Difficulty is a difficulty released for Bloons Tower Defense 5 Mobile in update 2.8. Being the newest and most challenging difficulty, it is unlocked at Rank 35 and offers higher rewards upon completion. In this difficulty, players begin with 1 life, with upgrades such as Healthy Bananas and Support Chinook providing no extra lives. Towers and upgrades are 20% more expensive than Medium Difficulty. Bloons in this difficulty are also faster and stronger, with the final round (85) spawning five Z.O.M.G.s instead of one.