Really Big Bombs

"Huge bombs deal greater damage in a large area and allow Frags to pop more Bloons."

- BTD6 description

Really Big Bombs is the third upgrade of Path 1 for the Bomb Shooter in Bloons TD 6. It increases explosion radius by another +50% (from 18 to 27), does extra damage (from 2 to 3), and increases pierce (from 30 to 50). When crosspathed with Frag Bombs, fragments have +1 pierce (2 pierce), last longer, and have larger hitboxes.

It cost $1,020 on Easy, $1,200 on Medium, $1,295 on Hard and $1,440 on Impoppable.

Summary
Really Big Bombs serves mostly as a stepping stone towards Bloon Impact. It deals increased damage overall and therefore it can be used to reduce stronger non-MOAB-class bloons into weaker groups. Really Big Bombs is usually less favored over alternate options, especially Cluster Bombs, due to the latter being more versatile at cleaning up weaker groups of bloons rather than ripping open tougher layers as Really Big Bombs is designed to do.

Its main niche is to rip open groups of tougher bloon layers into weaker groups. The high damage packed into single large explosions can be used to split large groups of stronger bloons into multiple weaker clumps, where other towers can clean up the groups of weaker bloons spawned out from the parent bloons. Really Big Bombs explosions are quite large, but they are still smaller than the combined blasts of a Cluster Bombs with Bigger Bombs, and Cluster Bombs is more reliable at cleaning up bloons in general. The only aspect of Really Big Bombs that makes it stand out compared to alternate, more superior Bomb Shooter upgrades is how its explosions can pop Rainbow Bloons such that they do not spawn any Zebra Bloons or Black Bloons, but even then Cluster Bombs currently makes this specific niche redundant.

Tips

 * Really Big Bombs is roughly equivalent to Bloon Impact except without the stun benefits. As such, it can be used to wipe out stronger non-MOAB bloons with ease, specifically against Rainbow Bloons where it can bypass the black-immune layers.
 * Since Bloon Impact can not pop Black Bloons, multiple Really Big Bombs may be better at pure damage overall if there is already a Bloon Impact on the map for stunning.
 * Really Big Bombs makes a good stepping stone to the more powerful Bloon Impact, but alone it is generally not as good as a 2-0-3 Cluster Bombs, as it doesn't have the bonus range or bonus explosions that can inflict more DPS.
 * One advantage of Really Big Bombs compared to a 2-0-3 Cluster Bombs is that it can have both the benefits of Path 1 and Path 2, for the larger explosions and the faster attack speed. However, 2-0-3 Cluster Bombs usually performs better overall for a lower price.
 * The best crosspath for Really Big Bombs is 3-2-0, as this gives it faster attack speed to break down clumps of bloons at a faster rate and catch faster bloon waves more effectively. 3-0-2 improves fragments, but the fragments are too weak at cleaning up groups of bloons to be worthwhile compared to a faster rate of applying high-damage explosions, and the black-popping power granted by 3-0-2 is currently outclassed by the reliability of 2-0-3 Cluster Bombs.
 * Setting a Really Big Bombs on Close around a tight bend may be used to maximize the potential of the bigger explosions, as it can be used as a cheaper version of Ring of Fire that can pop Purples instead of Blacks.

Trivia

 * Really Big Bombs became the second upgrade in BTD6 to cost $1200 on Medium, the first being Ultravision and third being Powerful Darts.
 * Each explosion from Really Big Bombs has a blast radius approximated as the explosions from the Bomb Tower (before renamed as Bomb Shooter in BMC and BTD6) with Bigger Bombs in Flash versions of Bloons TD 5 Generation games.
 * Ironically, the Bigger Bombs explosions in BTD6 each have a blast radius equivalent to the base BTD5 Flash Bomb Tower.