Shatter

Shatter is a damage type introduced in Bloons Tower Defense 2. It is defined as a damage type unable to damage Lead Bloons, but able to damage any other kind of bloon, including Frozen Bloons. The Bloons Wiki represents this damage type with, the Bloons TD 6 upgrade icon for Ice Shards.

It is a rare damage type, much rarer than Normal. Before Bloons TD 6, it was typically granted as a transition upgrade between a previous upgraded state with Sharp damage and a following upgrade with Normal damage.

Bloons Tower Defense 2
The Shatter damage type debuted in Bloons Tower Defense 2. Its purpose was to allow some towers whose default damage type was Sharp to attack Frozen Bloons. There were two upgrades granting Shatter-type damage. The Boomerang Monkey had Sonic Boom, and the Super Monkey had Laser Vision.

Bloons Tower Defense 3
Bloons Tower Defense 3 leaves the distribution of Shatter damage unchanged.

Bloons TD 4
Bloons TD 4 does not add any new upgrades with Shatter damage type. The Laser Cannon upgrade. which had Shatter type in the BTD5 generation, had Normal type damage in that game.

Bloons TD 5
Bloons TD 5 Flash introduced the Sniper Monkey, whose default damage type was Shatter. However, all further non-Flash games, such as Bloons TD 5 Mobile, changed the Sniper's default damage type to Sharp. Shatter also appears with the 9-Inch Nails upgrade for the Monkey Engineer in Bloons Monkey City Flash, Bloons TD 5 Deluxe, and all mobile versions of the games.

Laser Cannon was nerfed from Normal to Shatter, paving the way for Ray of Doom to possess Normal damage instead.

Shatter type appears for all of the following towers:
 * Sonic Boom
 * Sniper Monkeys in Flash versions
 * Monkey Engineer's 9-Inch Nails upgrade
 * Ice Shards icicle shards, except in Bloons TD Battles Flash where the upgrade was nerfed
 * Laser Cannon
 * Laser Blasts

Bloons TD 6
The introduction of the Purple Bloon in Bloons TD 6 caused the Shatter damage type to be split into two. Shatter-type laser upgrades were converted into a new type, Energy. Energy attacks could not pop Purple Bloons, but Shatter attacks could.

Some non-energy Shatter damage sources from previous games were exterminated. Sonic Boom was removed from the Boomerang Monkey's upgrade tree entirely. Boomerang Monkeys can now go straight to Normal-type damage via Red Hot Rangs without passing through Sonic Boom. Sniper Monkeys have a default damage type of Sharp, just like in Bloons TD 5 Mobile. 9-Inch Nails is renamed to Oversize Nails. Oversize Nails and Ice Shards were the only other returning upgrades with shatter type.

Some other towers took up the mantle of Shatter-type attacks in place of Sonic Boom and Laser Blasts. Icicles and Icicle Impale joined Ice Shards with their shatter-type icicles, with Impale also having the main blast be Shatter as well. Another tower newly possessing Shatter damage is the Druid, whose thorns gained Shatter damage via Hard Thorns, however this was later changed to Normal.

Another upgrade, the Spike-O-Pult, was later reclassified as Shatter in update 20.0. Powerful Darts and subsequent upgrades were upgraded to Shatter on 29.0, while Reactor without Heat-Tipped Darts was downgraded to Shatter on the same update.

Bloons Adventure Time TD
In Bloons Adventure Time TD, no upgrades giving shatter damage are known to exist (although Max formerly had an upgrade with such until that upgrade was removed entirely). However, the Dagger of Chilled Glass allows towers that cannot already pop lead to emulate this damage type.

The Missile aberrantly switches to Shatter when it targets a DDT. Hence, items granting the ability to pop Lead Bloons will allow the Missile to damage DDTs, despite DDTs being immune to the Explosion damage the Missile usually deals.

Bloons Pop!
In Bloons Pop!, Shatter replaces Sharp as the usual damage type for most Monkeys, allowing the Dart Monkey and Ninja Monkey, among others, to pop Frozen Bloons. However, the game still calls these Shatter-type attacks "sharp".

Bloons TD Battles 2
Powerful Darts had its damage type changed from Sharp to Shatter in Bloons TD Battles 2.