A Blue Bloon is a Bloon that appears in every Bloons game to date. In BTD series, it traditionally appears on the 3rd or 4th round. This can be altered for player-made levels in the Bloons TD 4 Track Editor if "Light" or "Hard" bloon progression is chosen. It is a "grandchild" of a Yellow Bloon, and it spawns from a Green Bloon; it spawns a Red Bloon. It is only slightly faster than a Red Bloon with a speed of 4 Blocks per second, and has the same speed as a Camouflage Bloon (BTD4). The RBE of a Blue Bloon is 1 (Bloons series) or 2 (other games), meaning it takes 2 hits to pop entirely.