Sharp

Sharp is a damage type introduced in Bloons Tower Defense, and has appeared in every Bloons TD game. It is defined as the damage type of attacks unable to pop Lead Bloons and Frozen Bloons, but can pop any other Bloon type. It was one of the first three damage types introduced to the series, the other two being Explosion and Metal Freeze. The Bloons Wiki represents this damage type with, the Bloons TD 6 upgrade icon for Sharp Shots, as darts are typically very sharp.

This damage type is the most common damage type encountered in the series, with a majority of towers having Sharp as their default damage type. It is often associated with sharp projectiles or weapons such darts, tacks, arrows, and swords.

Bloons Tower Defense
All towers except the Ice Tower and Cannon dealt Sharp damage in the first Bloons Tower Defense game.

Bloons Tower Defense 2
Bloons Tower Defense 2 introduced the Boomerang Monkey whose damage was Sharp by default. Additionally, it introduced ways to upgrade a tower's Sharp attacks to Shatter, namely Sonic Boom and Laser Vision.

Bloons TD 4
Bloons TD 4 introduced the Monkey Ace, Monkey Buccaneer, Spike Factory, and Dartling Gun, who were all by default Sharp.

Bloons TD 5
The Ninja Monkey, with a default damage type of Sharp, debuted in Bloons TD 5.

The Sniper Monkey's default damage type was changed from Shatter to Sharp in Bloons TD 5 Mobile and its derivatives.

Bloons TD 6
The Druid, with a default type of Sharp, was introduced. Semi-Automatic is now Sharp, unlike its BTD5 counterpart Semi-Automatic Rifle. Robo Monkey without the energy crosspaths are now Sharp too.

Patch 25.0 changed the damage type of The Tack Zone from Normal to Sharp as a nerf.

Patch 26.0 changed Glaive Lord's orbital rings from Normal to Sharp, a nerf supposed to encourage the use of the Red Hot Rangs crosspath; the attack speed crosspath was previously the most popular one.

The third instance of a patch of changing damage types of towers from Normal to Sharp was in Version 28.0, which removed that for Full Auto Rifle and Elite Defender, both likely done to reduce trivialization of Deflation games as well as to accommodate for the allowance of shrapnel buff inheritance on the same update. While this rework has no effect for the Path 1 crosspath, this rework has caused the shrapnel crosspath to further rely on receiving lead-popping via Acidic Mixture Dip.

Path 29.0 changed the damage type of both Bloontonium Reactor and Energizer from Normal to Sharp. They now require Heat-Tipped Darts crosspath to regain normal type. Previously, 4-0-2 and 5-0-2 were the most common crosspaths.

Bloons Adventure Time TD
In Bloons Adventure Time TD, most towers have a default type of Sharp. These include characters who can equip swords, instruments, and darts.

Marceline's default damage type is wrongly labeled as Normal in-game. It is in fact Sharp.

Bloons Pop!
Unusually, the Sharp damage type does not exist in Bloons Pop!. Instead, all towers that usually have Sharp damage instead are demonstrated to have Shatter damage, since they pop Frozen Bloons. However, the game still calls its Shatter-type attacks "sharp".

Bloons TD Battles 2
Bloontonium Reactor was demoted from Normal to Sharp in Bloons TD Battles 2. It can regain Normal damage by crosspathing with Heat-Tipped Darts.

Update 1.0.4 changed the damage type of The Tack Zone from Normal to Sharp as a nerf.