As an upgrade from Bloon Impact, Bloon Crush can stun both regular bloons and MOAB-class Bloons for 2s, making it extremely effective in later rounds where many ZOMGs and DDTs are spawned. Combined with its fair attack speed, it can essentially permanently stun any bloon (except the BAD). It now pops any bloon type, including Black Bloons, which means it can also affect DDTs effectively.
As with many of the Path 1 crosspath benefits, the 5-0-2 Bloon Crush crosspath increases potency of Frag Bombs. Each fragment will deal 12 damage to up to 3 bloons, instead of 2 damage and 2 pierce from a 4-0-2 Bloon Impact.
The Bloon Crush absolutely halts almost every round up to 99 as long as there is damage support for the dense clumps of MOABs and Super Ceramics, such as from Sun Avatar. Unfortunately, the Bloon Crush lacks self-sufficient damage and comes with a very high price, making it fairly difficult to use in a normal game. However, with a decent income generation, the Bloon Crush is able to be bought sooner, allowing its combined damage and stuns to come into play. In freeplay late-game, Bloon Crush occupies the role of a staller, which makes it fairly useful in normal late-game too.
For the Bloon Crush, it is strongly advised to place it on "Strong" target priority so it can focus on MOAB-class Bloons.
Due to the increase in stun time, even without crosspathing the Bloon Crush can reliably stun MOABs. However, the 5-2-0 Bloon Crush crosspath is usually the best option if there are too many bloons nearby to keep its stun reliability, though 5-0-2 offers much stronger fragments.
An extremely powerful combo is to use Bloon Crush with Pop and Awe and Striker Jones. The stun from Bloon Crush roughly triples the damage from Pop and Awe due to the latter's special properties, and Striker Jones can reset the Pop and Awe ability, provide additional stun and increase all properties of both towers. This combo struggles against the BAD, so some BAD-specific support (like a Perma-Spike or First Strike Capability) is recommended.
Place a Bloon Crush in areas where the track intersects itself multiple times. This will make the Bloon Crush more effective, as it will be able to stun MOAB-class Bloons multiple times over instead of just in a small area.
Use Jungle Drums to increase the attack speed of the Bloon Crush to ensure that it stuns as many Bloons as possible.
Striker Jones' ability Artillery Command at level 20 is useful as it gives double damage and pierce to all Bomb Shooters on the screen for 10 seconds. Additionally, at level 4, Striker Jones makes all Bomb Shooters on screen fire ~11.1% faster (or ~23.4% at level 18)
Bloon Crush has gained some buffs in BTD6 history, although overall slightly. The biggest buff here is refreshing stuns, allowing Bloon Crush to permastall bloons and blimps if hitting them persistingly.
Bloon Crush damage increased (6 → 12).
Bloon Crush (along with Bloon Impact) can now refresh their own bloon stuns.
Bloon Crush range increased (40 → 43).
502 Bomb Shooter increases pierce of frags from 1 → 2.
502 Bomb Shooter increases damage of frags from 1 → 2.
502 Bomb Shooter increases lifespan of frags from 0.191s → 0.322s.
Some low tier Bomb pierce has been shifted further up into the 2xx Heavy Bombs upgrade to [...], but the price of these upgrades and [...] have both been buffed to benefit other variations of bomb better. Bloon Impact's price was increased as it didn't need to benefit from this buff, and a buff was made to 502's Bloon Impact's frags to alter this underused crosspath.
~ Ninja Kiwi
Bloon Crush pierce increased (48 → 50).
502 Bloon Crush frag damage increased from 3 → 12.