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O.T.T.O's Outpost10
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"O.T.T.O's home and the main building of the second stage. May contain additional feisty robots. Destroying O.T.T.O's Outpost awards an extra star in attacks."

O.T.T.O's Outpost1
Level 1
O.T.T.O's Outpost2
Level 2
O.T.T.O's Outpost3
Level 3
O.T.T.O's Outpost-4
Level 4
O.T.T.O's Outpost-5
Level 5
O.T.T.O's Outpost6
Level 6
O.T.T.O's Outpost7
Level 7
O.T.T.O's Outpost8
Level 8
O.T.T.O's Outpost9
Level 9
O.T.T.O's Outpost10
Level 10


  • O.T.T.O's Outpost is the central building in the second stage of the Builder Base, similar to how the Builder Hall is the central building for its first stage. Protection of the O.T.T.O's Outpost is critical for preventing players from getting one star on your base in an attack. Upgrading O.T.T.O's Outpost allows you to improve its statistics.
  • Upon destruction of the outpost, Zappies will spawn from it. Upgrading O.T.T.O's Outpost increases their Hitpoints, DPS, and number spawned.
    • The Zappies can still spawn even if the O.T.T.O's Outpost is upgrading, meaning that upgrading the Outpost does not impede your defense.
  • Once it is available, O.T.T.O will serve as the permanent second builder of the Builder Base.
  • Despite having defensive capabilities via its Zappies, O.T.T.O's Outpost does not count as a defensive building for stage quotas (it is instead locked to being placed in stage two). It will not meet the defense-upgrading requirement of B.O.B Control if it is upgraded to level 9.
  • Unlike the Builder Hall, upgrading the O.T.T.O's Outpost has no bearing on Builder Base progression; upgrades within the Builder Base are still controlled by the Builder Hall level.


Defensive Strategy

  • Protection of O.T.T.O's Outpost is critical for defense, as letting it be destroyed will give up a star to the attacker, regardless of existing damage on the stage. Additionally, the defenses can provide support to the Zappies that spawn when the Outpost is destroyed.
  • O.T.T.O's Outpost has the highest hitpoints of any relative level building, with the exception of Walls, which means they take a long time to destroy. Placing O.T.T.O's Outpost within the range of your most powerful defenses can give them the most shots to destroy enemy troops.
    • The Zappies themselves have relatively high HP and deal good damage as well, further holding back the opponent.
  • Do not place O.T.T.O's Outpost in a corner surrounded by Walls, as troops can still be placed next to O.T.T.O's Outpost.

Offensive Strategy

  • Because it functions as the Builder Hall of stage 2, try to destroy it, as that will nab you an extra star.
  • Due to the power of the Zappies, it is best to use a troop ability to clear them out before the Zappies and other defenses do major damage. Baby Dragon's Fiery Sneeze, Drop Ship's Skeleton Bomb, Power P.E.K.K.A's Overcharge, Battle Copter's Bomb Rush, even Bomber's bouncing bomb (as the bomb can bounce twice and kill the zappies) are all powerful splash abilities that can heavily damage, if not wiping out most, if not all the Zappies.
  • If you have very few troops to work with for stage two, and do not expect to make much progress, you could try to snipe the O.T.T.O's Outpost for a 4-star, which will net more trophies and loot than a 3-star regardless of damage. Power P.E.K.K.As' Overcharge damage is excellent for this, with two of them using their Overcharge being able to destroy a relative-level Outpost (one may suffice if the Outpost is underleveled), and they can do this damage even if separated from the Outpost by one layer of Walls - at Builder Hall 9 or above, you can carry two Power P.E.K.K.As for this in your Reinforcement Camps.
    • High-level (level 16+; recommended level 20) Baby Dragons can also be used with their Fiery Sneeze ability, due to its misleadingly large area of effect. However, since the ability does less damage than the Power P.E.K.K.A's Overcharge, this only works well on low level Outposts. Against a relative-level Outpost, three or four may be required.

Upgrade Differences

  • O.T.T.O's Outpost undergoes significant visual changes at levels 2, 5, 6, 8, and 9.
    • When initially constructed, O.T.T.O's Outpost is a two-roofed small building, with the entrance on the lower roof. The roofs are made of unorganized square wood planks stacked over each other. On the upper roof, and there is a Hammer and Saw panel on a wooden plank slab. To the left side, there is a giant wooden hamster wheel made of big wooden planks and tied together with rope. There is a Zappy in it, charging the outpost by spinning it clockwise. On the right, there is an makeshift electricity pole connected to another Zappy by wire, which is being charged by the outpost.
    • At level 2, the roofs become made out of wood planks, with the bottom roof having two perpendicular planks bolted to it.
    • At level 3, the metal ends of the sides of the top of the electricity poll are surrounded by steel toruses.
    • At level 4, the wheel becomes replaced with smaller wooden planks and held together by two metal strips.
    • At level 5, the roof becomes made out of curved clay tiles.
    • At level 6, a stone disc spinning counter-clockwise is added to the side which has many steel balls attached to it. A giant metal ball on top of the pole is added which connects to the toruses.
    • At level 7, a wooden barrel is added next to the entrance.
    • At level 8, the wood planks under the panel and the wooden barrel change to blue.
    • At level 9, the roof changes again to giant metal plates bolted to each other. The panel is now one blue steel slab with steel accents near the corners.
    • At level 10, the wheel's planks become blue and the metal strips become gold.


Number Available Builder Hall Level
1 2 3 4 5 6 7 8 9 10
Total 0 0 0 0 0 1 1 1 1 1
Stage 1 Limit 0 0 0 0 0
Stage 2 Limit 1 1 1 1 1
Size Size
Spawned Zappies
Summon Capacity
Build Cost
Builder Gold
Build Time
Experience Gained
Builder Hall Level Required
Builder Hall
1 650 2 N/A N/A N/A 6
2 800 2 1,000,000 1d 293 6
3 975 2 1,250,000 2d 415 6
4 1,150 3 1,500,000 3d 509 6
5 1,350 3 1,750,000 4d 587 6
6 1,600 3 2,000,000 5d 657 6
7 1,850 4 3,000,000 7d 777 7
8 2,150 4 4,000,000 9d 881 8
9 2,450 4 5,000,000 10d 929 9
10 2,750 5 6,000,000 11d 974 10

Icon Descriptions

Icon MagicItemsTapping this icon displays information about your inventory of Magic Items.
Icon ChangeSceneryTapping this icon allows you to change between any Sceneries that you have unlocked.
Icon UpgradeTapping this icon begins upgrading the O.T.T.O's Outpost to the next level, if you have enough resources and a free Master Builder or O.T.T.O. When the O.T.T.O's Outpost is at maximum level, this icon is not shown.
Icon HoBTapping this icon instantly upgrades the O.T.T.O's Outpost to the next level, at the cost of one Hammer of Building if you have one. When the O.T.T.O's Outpost is at maximum level, or the Builder Hall requirements for the next level are not met, this icon is not shown.
Icon FinishNowTapping 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 FinishNowBoBTapping 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 FinishNowBoETapping 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 CancelTapping this icon, which is displayed only while an upgrade is in progress, cancels the current upgrade and refunds half of the upgrade cost.


Patch Type Description
May 15, 2023 Update Added the O.T.T.O's Outpost as the Stage 2 Hall with 10 levels to their respective Builder Hall levels. O.T.T.O's Outpost1O.T.T.O's Outpost2O.T.T.O's Outpost3O.T.T.O's Outpost4O.T.T.O's Outpost5O.T.T.O's Outpost6O.T.T.O's Outpost7O.T.T.O's Outpost8O.T.T.O's Outpost9O.T.T.O's Outpost10


  • The O.T.T.O's Outpost has the same hammer and saw on top as the Builder's Hut, serving as a nod for its similar function of housing a builder. In this case, O.T.T.O.
  • The addition of Zappies to the game is another instance of Clash of Clans introducing troops that were from Clash Royale, the 05/24/2016 update introduced Baby Dragons and Miners. Skeleton Spell later got reworked to use Guards.
  • If O.T.T.O's Outpost is destroyed as the last building to get 200% destruction, the Zappies will not appear.
Builder Base Buildings
Defensive Buildings CannonDouble CannonArcher TowerHidden TeslaFirecrackersCrusherGuard PostAir BombsMulti MortarO.T.T.O's Outpost (Zappy) • RoasterGiant CannonMega TeslaLava LauncherX-BowWalls
Traps: Push TrapSpring TrapMineMega Mine
Resource Buildings Builder Hall (Magic Items) • Gold MineElixir CollectorGold StorageElixir StorageGem MineB.O.B Control
Army Buildings Builder BarracksArmy CampStar LaboratoryBattle Machine AltarReinforcement CampHealing HutBattle Copter Altar
Other Buildings BoatDecorationsObstaclesClock TowerElixir Cart