The Nested Blue is a Basic Blooncard in Bloons Card Storm. It spawns a Red Bloon if it is destroyed, and the bloon does not inherit the delay of the Nested Blue.
The extra Red Bloon inside forces the opponent to carefully pop the Nested Blue, rather than rely on high single-target damage.
Compared to the other Nested Bloons, playing a Nested Blue is easier early on due to cost, but is a poor choice to begin if the opponent has Dart Monkey Twins. Additionally, its HP is unable to survive two Spike Storm! outside of Dark Castle (poor candidate for Bloon Embiggen strategies), and its Rare rarity may block Rare Power draws of better cards. Instead, for combos, it stands out as a cost-effective feed for Bolstered Bloon.
Most of the Nested Blue's strengths derive from its powerful parents, the Nested Green and Nested Yellow.