Adrenaline is an attack style characterized as gaining attack speed based on the number of individual Bloons, regardless of their RBE, that have their dead centers within triggering range. It is introduced in Bloons TD 6, with the introduction of Rosalia. It is part of the attack interactions family.
Adrenaline is represented on the Bloons Wiki as 
, the portrait for Level 2 Rosalia, who has this attack style starting from Level 4. It is different from Elite Defense 
, as it increases attack speed as bloon are getting closer to the exit. It is different from Wrath 
, which reacts to the total RBE from all Bloons, regardless of Bloon count, that are on the screen.
