Clock Tower9.png
"The Clock Tower makes things happen faster in your village! Collect resources, research and build faster."

Clock Tower Ruin.png Clock Tower1.png Clock Tower2.png Clock Tower3.png Clock Tower4.png
Ruin Level 1 Level 2 Level 3 Level 4
Clock Tower5.png Clock Tower6.png Clock Tower7.png Clock Tower8.png Clock Tower9.png
Level 5 Level 6 Level 7 Level 8 Level 9

  • Summary
    • The Clock Tower is a building unlocked at Builder Hall Level 4.
    • It appears to be a Tower with a clock on top in which a hand turns clockwise.
      • The Clock Tower's hand turns very fast when boosting.
    • When activated, the Clock Tower will make timers in the Builder Base speed ten times as fast as normal for a short duration. This duration can be increased by upgrading the Clock Tower.
      • It will speed up resource collectors, construction, upgrades and research timers.
    • The Clock Tower will not reduce the cool-down time of loot from Versus Battles.
    • The Clock Tower will occasionally make a free boost available. Once a free boost has been completely expended, there will be a 22 hour cooldown before the next free boost is available.
      • If the Clock Tower is not active, it can also be activated using Gems. A Clock Tower Potion can also be used to boost the Clock Tower for 30 minutes at any time (this duration is independent of Clock Tower level, and the potion works regardless of whether or not the Clock Tower is active).
    • Upgrading the Clock Tower will disable its ability to boost during the upgrade. If a Clock Tower upgrade is started while a boost is active, the boost will end prematurely with no compensation.

  • Strategy and Tips
    • Use the Clock Tower's boost when upgrading or researching something in the Builder Base. However, the Clock Tower will not boost the Master Builder when he is working in your Home Village.
      • Even if the Star Laboratory and builders are inactive, it can still be useful to boost, as it still speeds up resource production slightly (gaining a few hours' worth of Builder Gold and Elixir).
    • The Clock Tower is best placed outside the base as a distraction as it serves little, if any purpose on defense. Its 4x4 space makes it difficult to fit within the Walls. Additionally, due to its larger size, it may be easier to pick off than other buildings if defenses aren't placed properly.
    • The Clock Tower can be used to hide an opening in the Walls which can cause unexpected behavior in certain troops (such as Boxer Giants), and can also be used to funnel troops into traps. However, experienced players can see through this trick (for instance, by counting the wall segments) and plan their attack accordingly.

  • Upgrade Differences
  • Each time the Clock Tower is upgraded (depending on what level) you can see Roman numerals (I-IX) on the left side that corresponds to the level of the Clock Tower.
    • The Clock Tower goes through significant visual changes at levels 1, 3, 5, 7, and 9.
      • At level 1, the Clock Tower is rebuilt from its broken state but parts are still in disrepair.
      • At level 2, the roof planks are fixed and reinforced.
      • At level 3, the front undergoes a major repair. A large ladder is placed on the front. The upright barrel at the side switches place with the sideways barrel. A trapdoor replaces the repairs on the roof. There is also additional stairs below the doorway. The Clock Tower becomes taller.
      • At level 4, the trapdoor hinges become metal and a metal frame under the trapdoor appears.
      • At level 5, the ladder is replaced by a cross in the front. You can also now see the gears inside through the "window" on the side of the tower.
      • At level 6, the holes in the trap door on top turns into a whole piece of metal.
      • At level 7, the front-bottom part gains two openings with one rotating gear each. The two front pillars gain some extra reinforcements and the side gains more steps.
      • At level 8, the hatch at the top of the tower is raised slightly, leaving a small opening where a bell can be seen.
      • At level 9, the gears are now golden while the hatch at the top of the tower is raised higher. The staircase receives railings on both sides.

  • Trivia
    • The Clock Tower sits with obstacles at the left side of the map when broken.
    • On 6/26/2017, the Clock Tower's boost duration was reduced by 50%, its boost speed was reduced to 8x (from 10x), and its cool-down time was reduced to 7 hours (from 8 hours).
    • On 3/30/2020, the Clock Tower's boost duration was greatly increased, and its boost speed was increased to 10x (from 8x). Its cool-down was increased to 22 hours (from 7 hours).
    • Above the door of the Clock Tower, you can see Roman numerals which correspond to the building's level. This is also on the Star Laboratory.
    • The Clock Tower's hand makes a full rotation every 30 seconds. This is double the speed of the second hand on a regular clock.
    • While a boost is active, many animations also appear to speed up as well. The Master Builder, Villagers as well as Troops stationed in Guard Posts and Army Camps move faster. The latter is purely aesthetic; troops will not move or attack faster during a Versus Battle while under a boost.
    • The Clock Tower was added on 22/5/2017.
    • Interestingly, when fixing the three broken buildings in the Builder Base, the Gem Mine and Battle Machine fixes are called a "rebuild", while the Clock Tower is called a "repair". In fact, the Clock Tower is the most broken out of the three, thus the one that needs a rebuild the most.
    • The Clock Tower's destroyed state is similar to the Town Hall's or Builder Hall's destroyed state.

  • Icon Descriptions
    Icon Upgrade.pngTapping this icon begins upgrading the Clock Tower to the next level, if you have enough resources and a free Master Builder or O.T.T.O. When the Clock Tower is at maximum level, this icon is not shown.
    Icon HoB.pngTapping this icon instantly upgrades the Clock Tower to the next level, at the cost of one Hammer of Building if you have one. When the Clock Tower is at maximum level, 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.
    Icon FreeBoost.pngTapping this icon activates the Clock Tower, boosting timers in the Builder Base by a factor of ten for a duration determined by the level of the Clock Tower. This icon is only displayed when a free boost is available.
    Icon CTP.pngTapping this icon activates the Clock Tower, boosting timers in the Builder Base by a factor of ten for 30 minutes, at the cost of one Clock Tower Potion. This icon is only displayed if you have at least one Clock Tower Potion.
    Icon BoostNow.pngTapping this icon allows you to boost the Clock Tower before its free boost is available, at the cost of the displayed amount of Gems. This icon is only displayed when the Clock Tower's free boost is in cooldown.
    Placeholder.pngTapping this icon resumes a paused Clock Tower boost. This icon is only shown if you have an active Clock Tower boost that was paused by a maintenance break.
Builder Hall Level 1 2 3 4 5 6 7 8 9
Number Available 0 0 0 1 1 1 1 1 1
Size Size
4x4
Level
Level
Hitpoints
Hitpoints
Boost Duration
Time
Time Gained per Boost
Time
Relative Boost* Catch-Up Point of Construction** Catch-Up Point of Boost*** Build Cost
Builder Gold
Build Time
Time
Experience Gained
Experience
Builder Hall Level Required
Builder Hall
1 650 14m 2h 6m 9.4% 1 time N/A 150,000 2h 84 4
2 800 16m 2h 24m 10.8% 10 times N/A 180,000 3h 103 4
3 960 18m 2h 42m 12.1% 14 times N/A 220,000 4h 120 4
4 1,152 20m 3h 13.4% 20 times N/A 300,000 6h 146 4
5 1,382 22m 3h 18m 14.8% 27 times N/A 700,000 8h 169 5
6 1,658 24m 3h 36m 16.1% 34 times N/A 1,200,000 10h 189 6
7 1,990 26m 3h 54m 17.4% 40 times N/A 1,700,000 12h 207 7
8 2,388 28m 4h 12m 18.7% 80 times 2 times 2,200,000 1d 293 8
9 2,507 30m 4h 30m 20.0% 120 times 9 times 2,700,000 1d 12h 360 9

* Relative boost refers to the total time gain as a percentage of 22 hours (the cooldown for a free boost) plus boost duration (added because the cooldown starts countdown after the boost duration), and hence how much faster time will progress in your Builder Base on average. This is assuming that you activate the Clock Tower as soon as the 22 hour cooldown ends, and also assumes that you do not spend any Gems in activating the Clock Tower early.

** The Catch-Up Point of Construction is the minimum number of boosts for which the newly upgraded Clock Tower has equaled the time for upgrading the Clock Tower had it not been upgraded - this does not consider recovering the cost of the Gold required to perform the upgrade.

The formula of Catch-Up Point of Construction time is:

*** The Catch-Up Point of Boost is the minimum number of boosts for which the newly upgraded Clock Tower has provided enough time gain such that the time lost by the inability to immediately use the free boost due to the construction of the Clock Tower is negated. This does not apply to Clock Towers level 7 and below, whose construction time is less than the current cooldown time of 22 hours.

The formula of Catch-Up Point of Boost is:

(given that )

where

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
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