Hidden Tesla

Lay a deadly trap with the Hidden Tesla. Our Wizards have trapped a storm cloud into each of these sneaky towers. When an enemy walks or flies close enough, the tower springs up and fries it using the power of Electricity.

Hidden Tesla 

• Hidden Tesla is unlocked at Town Hall level 7.
• Hidden Tesla is a defensive building with a twist: Similar to a Spring Trap or Bomb, it stays hidden and appears when a ground or air unit gets close, or when 51% of the base is destroyed. However, unlike a Trap, it does not have to be rearmed after being deployed.  
• A major source of confusion regarding the Hidden Tesla is that while it has a range of 7, it has a trigger range of 6. 
• The Hidden Tesla will not appear unless the enemy units come within its 6-tile trigger range. The only exception to this rule is that Hidden Tesla’s will reveal themselves once a base has incurred at least 51% damage, as they must be destroyed (along with all other buildings) in order to achieve 3 stars. 
• the Hidden Tesla is revealed, it will stay visible and attack units out to its maximum range of 7 tiles until it is destroyed. Hidden Tesla deals double damage to P.E.K.K.As and prioritizes them over other troops.
• A max-level Hidden Tesla deals the most constant damage of any defensive building that can target both ground and air troops, beating out the max-level Archer Tower by 1 DPS (damage per second).

Defense

• The advantage of the Hidden Tesla is that it is (hopefully) a surprise. Capitalize on that. A well-placed Hidden Tesla can inflict destruction on an attacker's offensive strategy.
• Unfortunately, many players design their villages such that it has only as many 2x2 open spaces within its layout as it has Hidden Tesla’s (and possibly Giant Bombs) available, which makes it obvious where they are located. Instead, try to make sure that there are a few different places where Hidden Tesla’s could be lurking.
• A good strategy is to create "dummy" 2x2 open spaces to make the enemy think they know where your Hidden Tesla’s are. For example, you unlock 2 Hidden Tesla’s at Town Hall 7. You could create two empty 2x2 spaces in your base which are actually empty, while deploying your Hidden Tesla’s elsewhere, increasing the chances of surprising your opponent.
• Be cautious when upgrading the Hidden Tesla, as this will reveal its location to future attackers. Combat this by relocating it during the upgrade period.
• Although a Hidden Tesla being upgraded loses the merit of being invisible, it still keeps the demerit of being unable to cause a no-spawn zone.
• Make sure to place your Hidden Tesla in a space where Troops cannot be placed (an empty space no larger than 2x3), as unlike other defenses structures.
• Hidden Tesla’s do not expand your no-spawn zone, meaning that Troops can be placed directly on top of a Hidden Tesla.

Offense

• Before attacking, look for obvious places where a Hidden Tesla might be located, and avoid them.
• Hidden Tesla’s will only activate when Troops come close to them. If one happens to trigger, keep in mind that it has a low range. If you cannot destroy it easily, avoid deploying more Troops near it if possible.
•  Hidden Tesla’s can deal high amounts of damage.If you see a 2x2 empty square space surrounded by Walls, it is very likely that a Hidden Tesla has been placed there. Be aware that Hidden Tesla’s are only for Town Hall level 7+. If it is a Town Hall 6, it is most likely a Giant Bomb.
• One Giant and a few Archers can quite easily destroy a Hidden Tesla, as it has relatively low health.
• Some people have free places inside Walls, but place a Hidden Tesla to deceive the enemy.
• If you have the opportunity to observe a village prior to attacking, such as when planning a revenge, then watch the Villagers. They can reveal the location of Hidden Tesla’s by walking up to the "empty" spot where the Tesla is hidden and clapping.

Upgrade Differences

• Hidden Tesla’s undergo significant visual changes at levels 4, 7 and 8.
• When initially constructed, the Hidden Tesla consists of a tall, slender wooden lattice structure with a wire coiled up one support. The top of the tower has a metal conducting rod protruding from it. On each side of the tower's base are what appear to be open trapdoors, evidence of the fact that it buries oneself under the ground until an enemy comes through.
• Levels 2 and 3, Hidden Tesla’s gain additional metal conductors hanging down from the top of the tower, and a second wire coiled up the support on the opposite side of the tower.
• Level 4 Hidden Tesla acquires its namesake Tesla coil at the top. 
• Level 5, the metal conductor pieces turn golden yellow, and a third coil of wire appears on the front support. 
• Level 6, the Tesla coil itself turns golden as well.
• Level 7 Hidden Tesla replaces the Tesla coil with a set of massive horizontal bronze rings. The three smaller wire coils on the tower supports disappear and are replaced with a very thick coil of wire running up the front support. When it fires, the rings glow a steady blue.
• Level 8 Hidden Tesla replaces the horizontal bronze rings with a set of transformer coils and is black with a yellow glow in the middle. More wires appear wrapped around the building, and zaps of electricity jump from the tower several times per minute.