The Wall Breaker's appearance is that of a small skeleton that wears a brown aviator hat and has a small scar across its right eye socket. It carries a large bomb.
The Wall Breaker attacks by locating the nearest protected building and destroying its protective Wall by blowing itself up kamikaze style. It deals splash damage around its target and deals 40x damage to Walls.
Upon dealing damage, Wall Breakers will perish (regardless if they damage a Wall, building or enemy Troop).
Wall Breakers prioritize Walls above all other targets, and will completely ignore any building or enemy troop while even a single segment of Wall exists on the battlefield. If all Wall segments are destroyed, Wall Breakers become like any other troop with no preferred target and will attack the nearest building to them regardless of type (although they still blow themselves up in their single attack). If (once all Walls are destroyed) they happen to become aware of an enemy troop, hero or Skeleton Trap skeleton prior to completion of their attack, they will change targets to attack the enemy unit instead.
Wall Breakers destroy Walls faster than any other unit and make gaps for other units such as Giants to enter the opponent's base.
Wall Breakers will look for the nearest building/turret that is trapped (fully or partially) by Wallsand target any Wall that is trapping them. The exact mechanic can be found in the video below.
Wall Breakers cost a fairly high amount of Elixir and, due to their low health, spamming Wall Breakers will result in many losses. To combat this, one or two Giants may be placed first to distract the nearby defensive structures. Wall Breakers can then be used to target Walls without being fired upon.
Giants and Wall Breakers make an excellent team: The Giants distract and in return the Wall Breakers destroy the wall. Then the Giants can move in successfully. All possible with teamwork; although Mortars can be capable of taking out Wall Breakers in one shot.
Wall Breakers can be extremely effective if you deploy 2 at a time very quickly, and do a straight line of 2 Wall Breakers each.
Once Wall Breakers have destroyed a protecting Wall, the remaining Wall Breakers will proceed to destroy the protecting inner Walls.
Wall Breakers have small amounts of health so use them wisely.
Before you deploy Wall Breakers, place a couple Barbarians or Giants to soak up hits so the Wall Breakers don't die before they explode. It is helpful to place the Barbarians or Giants a short distance away from the target Wall so that splash damage from a Mortar or Wizard Tower won't catch the Wall Breakers as well.
Wall Breakers do splash damage, so it can also be used to finish off buildings close to the Walls.
Supporting the Wall Breaker with a Rage Spell is a good idea, because the Rage Spell will make the Wall Breaker do more than double damage. A maximum-level Wall Breaker coupled with a Rage Spell can one-shot level 10 Walls.
Wall Breakers are not fooled by spiked or decoy Walls.
Wall Breakers will not target a Wall unless it can see a building behind it.
Note that Wall Breakers will not target single Walls. There needs to be at least 3 connected Walls for a Wall Breaker to target it, and it must be protecting a building fully or partially.
Having double layers of Walls is ineffective vs. Wall Breakers, as Wall Breakers deal splash damage that will destroy both layers of Walls.
Always try to keep less important buildings outside of your walls (collectors, builder huts, etc.), so the enemy's Wall Breakers have to be placed farther away. This increases the chances of the Wall Breaker getting killed by your defensesbefore it blows up your walls.
Wall Breakers are not recommended to have in Clan Castles, since they have to blow themselves up to destroy the opponent's troop, they also do very little damage. However, they are good at clearing Tier 1 troops.
Due to Wall Breaker's low health, they usually die before reaching their target.
At level 3, the bomb that the Wall Breaker is holding becomes larger.