Blue Bloon

"Blue bloons move faster and have red bloons inside them."

- Round 3 in Bloons TD 1

"Coming up next are some blue bloons, then some more, then some more, then some more."

- Round 10 in BTD5

Blue Bloons are the second weakest type of bloon in the Bloons TD series. The RBE is 2. They traditionally appear on the 3rd round. This can be altered for player-made levels in the Bloons TD 4 Track Editor if "Light" bloon progression is chosen. They don't take anything special to pop. Blue bloons are also children of Green Bloons. Blue bloons are only slightly faster than red bloons, and have the same speed as Camo Bloons. The RBE of the blue bloon is 2, meaning it takes 2 hits to fully pop.

Trivia

 * The Blue Bloon is one of the 6 of the bloon types to appear in Bloons TD 1 and have the distinction of being in every Bloons TD game to date.
 * The Blue Bloon is the fourth slowest bloon (along with Camo Bloons) in the Bloons TD series. The third slowest moving bloons are Lead Bloons, Red Bloons, and M.O.A.B.s. The second slowest moving is the B.F.B. The slowest bloon is the new ZOMG bloon from Bloons TD 5.
 * The Mortar Tower's Bloon Buster upgrade and the Sniper Monkey, due to their ability to pop 2 or more layers, are the only towers that can pop a blue bloon in one hit.
 * Blue bloons were faster in BTD1 and BTD2, but they were slowed down in BTD3 and all later games to make those first few levels a bit easier.