The BFB is a type of MOAB-Class Bloon in Bloons TD 6. It first appears on round 60, or round 54 in Alternate Bloons Rounds. BFBs move much slower than MOABs and have larger hitboxes. Each BFB has 700 health and contains 4 MOABs. If Fortified, it has twice as much health and spawns Fortified MOABs. BFBs are immune to all attacks that only target up to MOABs (e.g. Level 5 Pat Fusty's slap attack). Like all MOAB-class Bloons, a BFB has four damage phases.
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BFBs are slower than MOABs but are more threatening in rounds that have large groups of them (e.g. rounds 75, 98), due to the many MOABs that can spawn when popped.
Giant Condor is more efficient against BFBs than MOABs, and excels at carrying them to a new location.
MOAB Press has decent knockback against BFBs. Both crosspaths are effective, with 2-0-4 preferred against dense groups of BFBs to stall them out for longer before the BFBs pop.