The Wall Breaker is the fifth overall troop unlocked in the Barracks.
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 (read: wall enclosed) building and destroying its protective Walls 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 Walls and 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. 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.
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 Walls 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 if they have enough hitpoints left for the Wall Breaker to successfully destroy them.
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 11 Walls.
Wall Breakers are not fooled by spiked or decoy Walls.
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 (Elixir Collectors, Builder's 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 defenses before 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 troops with low health.
At level 3, the bomb that the Wall Breaker is holding becomes larger.
At level 5, the Wall Breaker's bomb turns golden.
At level 6, the Wall Breaker's bomb change to a barrel of explosives, similar to a part of the Giant Bomb.
The Wall Breaker is one of two Troops of which the picture in the Barracks resembles an upgraded version, the other being the Dragon.
If there are no Walls and you deploy a Wall Breaker, it will run to the nearest building and blow itself up. However, it will do much less damage to the building compared to what it can do against Walls, e.g. a level 5 Wall Breaker will do only 46 damage to a building, whereas it will do 1,840 damage to Walls.
When Wall Breakers are sent to your Clan Castle, during an attack they will target the attackers and blow themselves up, which makes it a bad Troop to be donated for defensive purposes. When attacking, they are also pretty much useless, since they come out in large groups (like 5-10 at a time), blowing up a lot of Walls if they survive, but they may also die from a single Mortar shot. It is also quite rare for the remaining Wall Breakers to blow up the first layer of Wallsand the compartment inside.
Wall Breakers can be useful in the Clan Castle for low level players, though. If the low level player doesn't have Wall Breakers unlocked or the Wall Breakers are low level, a high level Wall Breaker or two in the Clan can really help them.
You can have a maximum of 120 Wall Breakers at one time in a complete set of fully upgraded Army Camps. This number increases to 137 if you include the 17 that can fit into a level 6 or higher Clan Castle. On the battlefield, you can clone an additional 40 Wall Breakers with two fully upgraded Clone Spells.
Note: Having this many Wall Breakers is highly discouraged (only second to an all-Healer army) as your army will end up breaking nothing other than Walls.
Wall Breakers take up two spaces in your Army Camp as of the March 12, 2013 update. Prior to this update the Wall Breaker took up only a single housing space.
Wall Breakers resemble dead Builders since both of them have similar leather hats.
In the Chinese language setting of the game, the Wall Breaker is called "Bomberman" literally, which could be a reference to the Hudson game Bomberman, in which the player-controlled Bomberman break through walls with his bombs, although this could be wrong because the Chinese meaning of Bomberman can also mean demolitionist.
As part of the May 4th 2016 update, the Wall Breaker's training time was decreased from 2 minutes to 1 minute.
During late October of 2016, the Wall Breaker's training cost was temporarily reduced by 50% and it's training time changed to 40 seconds to celebrate Halloween.