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For the Home Village version, see Hidden Tesla/Home Village.
Hidden Tesla9B.png

"Part tower, part trap, completely shocking! Zap air and ground foes alike with the power of science!"

Hidden Tesla1B.png Hidden Tesla2B.png Hidden Tesla3B.png Hidden Tesla4B.png Hidden Tesla5B.png
Level 1 Level 2 Level 3 Level 4 Level 5
Hidden Tesla6B.png Hidden Tesla7B.png Hidden Tesla8B.png Hidden Tesla9B.png
Level 6 Level 7 Level 8 Level 9


  • The Hidden Tesla is a single-target defensive building unlocked at Builder Hall level 3. Before it begins attacking, the Hidden Tesla remains completely hidden to the attacker. Once a unit is within 6 tiles of the Tesla, the Tesla emerges from the ground and begins attacking. Like its Home Village counterpart, it automatically emerges from the ground if it's still hidden when at least 51% of the base is destroyed.
  • It attacks enemies with electricity, just like its Home Village counterpart. It has the same fire rate and range as it too, however, its damage compared to equivalently leveled Hidden Teslas in the Home Village is higher at low levels, but lower at high levels.


Offensive Strategies

  • Enemies need a 2x2 clear space for a Hidden Tesla, evaluate the worst place for a Tesla placement and deploy accordingly.
  • Sneaky Archers can show you the location of a Hidden Tesla, even when invisible. Placing one Sneaky Archer of the relative level or will be able to take down the Hidden Tesla.
  • You can use the Villagers clapping to identify the location of the Hidden Tesla, as the villagers will 'approve' nothing (which is really a Hidden Tesla). This will only work during the planning time however, and has the potential to back fire if you only focus on the Villagers during this time.

Defensive Strategies

  • The Hidden Tesla can be used to lure your opponent into an air attack, then take out the air units quite quickly. This is very effective at Builder Hall level three as they only have Beta Minions; when your opponent destroys your Firecrackers and Archer Tower, he/she will send in his/her Beta Minions only to get destroyed by your Hidden Tesla.
  • You can place a Hidden Tesla at the corner of a base (far away from everything else on the base) as a tactic to stall enemy attacks. If the enemy deploys their full army before achieving 51% (or otherwise revealing the Tesla), they will not have anything to immediately deal with the corner Tesla, which can stall out their attack should they destroy all other buildings on the base. Provided that you are able to 3-star their base, this can potentially allow you to achieve victory on the time tiebreaker.
  • The Hidden Tesla's element of surprise can be used to redirect enemies' first attacks onto them rather than onto a more valuable defense. Boxer Giants and Hog Gliders can be more effectively defended against with this tactic; the former will expend its high-damage Power Punch on the Tesla while the latter will crash into the Tesla, potentially stunning it over something else.

Upgrade Differences

  • The Hidden Tesla undergoes significant visual changes at levels 2, 3, 4, 7, 8, and 9. Their upgrade differences correspond to Hidden Teslas in the Home Village of equal level.
  • 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.
  • At level 2, the Hidden Tesla gains additional metal conductors hanging down from the top of the tower.
  • At level 3, a second wire is added for support on the opposite side, with some more stability on the bottom of the Tesla.
  • At level 4, the Hidden Tesla acquires its namesake Tesla coil at the top. The shots fired from it also get thicker.
  • At level 5, the metal conductor pieces turn golden yellow, and the third coil of wire appears on the front support. The bottom of the Tesla also turns gold for more support and the top part does too.
  • At level 6, the Tesla coil up the top turns golden.
  • At level 7, the Tesla coil is replaced 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.
  • At level 8, the Tesla replaces the horizontal bronze rings with a set of yellow transformer coils with a black shell, with a yellow bump on the middle one. The metal conductors changed from cardinal direction to diagonals. More wires appear wrapped around the building and spikes are added on the wood. Zaps of electricity jump from the tower several times per minute.
  • At level 9, a blue dot appears on the top of the Tesla, and the electricity chambers are all connected. Also, the wooden tower holding the Tesla gains more golden spikes.


  • The Hidden Tesla is one of the only defenses in the Builder Base which takes up a 2x2 space. The other being the Firecrackers.
  • The Hidden Tesla is one of the few defenses to have appeared in both villages. Other defenses that appeared in both villages include the Cannon, Archer Tower, and Walls, though in the latter's case the models are different for both the Archer Tower and Walls.
  • The Hidden Tesla gets its name and appearance from the Tesla coil, invented by the scientist Nikola Tesla. Tesla coils wirelessly transmit electricity to the destination; the way tesla coils transmit electricity appears similar to how the Hidden Tesla attacks.
  • Defense-targeting troops will not target a Tesla until it is revealed, even if all other defenses are destroyed.
  • The level 7 Tesla has the same top piece as the level 7 Laboratory.
    • In Clash Royale, the card "Sparky" shares the same feature.
  • If you don't count traps as defenses, the Hidden Tesla is the only defense that is hidden under the ground before it is activated.
  • In Clash Royale, the Tesla resembles a level 1 Tesla from Clash of Clans.
    • Unlike in Clash of Clans however, the Tesla in Clash Royale retreats back to the underground when there are no targets in its range.

Icon Descriptions

Icon Info.pngTapping this icon displays information about the Hidden Tesla, such as Level, Damage Per Second, Hitpoints, Range, Damage Type and Targets.
Icon Upgrade.pngTapping this icon begins upgrading the Hidden Tesla to the next level, if you have enough resources and a free Master Builder or O.T.T.O. When the Hidden Tesla is at maximum level, this icon is not shown.
Icon HoB.pngTapping this icon instantly upgrades the Hidden Tesla to the next level, at the cost of one Hammer of Building if you have one. When the Hidden Tesla is at maximum level, or the Builder Hall requirements for the next level are not met, this icon is not shown.
Icon FinishNow.pngTapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of the displayed number of Gems.
Icon FinishNowBoB.pngTapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Building. This icon is only shown if you have at least one Book of Building.
Icon FinishNowBoE.pngTapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Everything. This icon is only shown if you have at least one Book of Everything but do not have a Book of Building.
Icon Cancel.pngTapping this icon, which is displayed only while an upgrade is in progress, cancels the current upgrade and refunds half of the upgrade cost.

Builder Hall Level 1 2 3 4 5 6 7 8 9
Number Available 0 0 1 1 1 1 2 3 3
Size Size
Damage per Second
Damage per Shot
Build Cost
Builder Gold
Build Time
Experience Gained
Builder Hall Level Required
Builder Hall
1 41 25 300 50,000 30m 42 3
2 46 28 345 100,000 3h 103 3
3 51 31 397 150,000 5h 134 3
4 56 34 457 280,000 10h 189 4
5 61 37 526 700,000 1d 293 5
6 68 41 605 1,300,000 1d 293 6
7 75 45 696 2,100,000 2d 415 7
8 83 50 800 3,100,000 3d 509 8
9 91 55 840 4,100,000 4d 587 9
Range Trigger Range Attack Speed Damage Type Unit Type Targeted
7 6 0.6s Single Target Ground & Air
Builder Base Buildings
Defensive Buildings CannonDouble CannonArcher TowerHidden TeslaFirecrackersCrusherGuard PostAir BombsMulti MortarRoasterGiant CannonMega TeslaLava LauncherWalls
Traps: Push TrapSpring TrapMineMega Mine
Resource Buildings Builder Hall (Magic Items) • Gold MineElixir CollectorGold StorageElixir StorageGem MineO.T.T.O Hut
Army Buildings Builder BarracksArmy CampStar LaboratoryBattle Machine Altar
Other Buildings BoatDecorationsObstaclesClock Tower