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O.T.T.O Hut5
"Control center for Master Builder's latest invention! Once fully upgraded, B.O.B becomes an additional builder in the Home Village!"

O.T.T.O Hut1
Level 1
O.T.T.O Hut2
Level 2
O.T.T.O Hut3
Level 3
O.T.T.O Hut4
Level 4
O.T.T.O Hut5
Level 5


  • The B.O.B Control is a building unlocked at Builder Hall level 9. The B.O.B Control does nothing when initially built, and will only serve as a distraction defensive-wise then. However, once upgraded to level 5, it enables the B.O.B's Hut to be built in the Home Village, allowing B.O.B to function there.
  • Upgrading the B.O.B Control does not take time or resources, but instead, a certain prerequisite must be completed (and the Master Builder or O.T.T.O must also be available to upgrade the building). To upgrade the B.O.B Control to level 5, four such prerequisites must be satisfied.
    • To upgrade to level 2, you need to gear up a Cannon, Archer Tower and a Mortar in the Home Village. This requires a level 7 Cannon, a level 10 Archer Tower and a level 8 Mortar respectively in the Home Village, and a level 4 Double Cannon, a level 6 Archer Tower, and a level 8 Multi Mortar in the Builder Base.
    • To upgrade to level 3, you need to upgrade any troop to level 18 (which requires Star Laboratory level 9).
    • To upgrade to level 4, you need to upgrade any defensive building in the Builder Base to level 9.
      • Though having defensive capabilities, O.T.T.O's Outpost does not count as a defense for this purpose; Traps do not count either.
    • To upgrade to level 5, you need to upgrade the Battle Machine and Battle Copter to a combined level of 45.

Upgrade Differences

  • When initially constructed, the B.O.B Control is a stone platform with wood planks hammered on as a base. There is a loose ramp made out of wooden planks. There is a hammer and some nails, along with a pipe.
    • At level 2, a stone table is added and the pipe was now attached to the table. a wooden wheel wheel is placed on the side of the table.
    • At level 3, the table gains a wooden extension which covers the pipe away. B.O.B's eyes, arm and wind-up screw are placed on the table while the wheel is moved to the floor.
    • At level 4, a structure resembling a builder hut is added on the platform, concealing everything inside. There is a slot resembling an electric outlet with a spanner next to it.
    • At level 5, a coil with an orb is added to the top of the hut, which resembles the coil on O.T.T.O or B.O.B.


Number Available Builder Hall Level
1 2 3 4 5 6 7 8 9 10
Total 0 0 0 0 0 0 0 0 1 1
Stage 1 Limit 0 0 0 0 0
Stage 2 Limit 0 0 0 1 1
Size Size
Hitpoints Hitpoints Build Cost Builder Gold Build Time Time
250 100,000 None
Upgrade Requirements
Level 2 Gear Up all 3 buildings: Cannon, Archer Tower, Mortar
Level 3 Upgrade any troop to level 18
Level 4 Upgrade any defense to level 9
Level 5 Upgrade Battle Machine and Battle Copter to a total level of 45

Icon Descriptions

Icon InfoTapping this icon displays information about the B.O.B Control, such as Hitpoints and information regarding the tasks needed to upgrade the Hut.
Icon UpgradeTapping this icon also opens up the information screen, and allows the B.O.B Control to be upgraded to the next level, if you have completed the relevant task and if the Master Builder or O.T.T.O is free. When the B.O.B Control is at maximum level, this icon is not shown.


Patch Description
June 18, 2019 Added the B.O.B Control (then known as the O.T.T.O Hut), with 5 levels.
O.T.T.O Hut1 O.T.T.O Hut2 O.T.T.O Hut3 O.T.T.O Hut4 O.T.T.O Hut5
March 30, 2020 The visual boost effect for an O.T.T.O Hut can now be seen when the Clock Tower is active.
April 12, 2021 Fixed a bug where progress can wrongly be credited towards O.T.T.O tasks.
May 15, 2023 Renamed the O.T.T.O Hut to B.O.B Control, and changed its upgrade requirements.
  • As the level 5 upgrade had its requirements increased, mainly all troops(to confiscate pre-upgraded troops), players who had completed the O.T.T.O Hut prior to the update kept their upgrades and the associated rewards.


  • Since the level 2 B.O.B Control requires gearing up all 3 buildings currently available to be geared up, the upgrade effectively requires players to have Town Hall level 10 or above, since the Mortar gear up requires the Mortar to be level 8 (which requires TH10).
  • The B.O.B Control has the same amount of hitpoints and Build Time as a Builder's Hut from the Home Village.
  • The B.O.B Control is the only building that requires other non-central buildings to be upgraded to a certain level or modified to be upgraded, unlike all the other buildings, which take time and cost resources and central building level.
  • The B.O.B Control, the Battle Machine Altar, and the Battle Copter Altar are the buildings in Builder Base that have the least amount of hitpoints.
  • The B.O.B Control and the X-Bow are the only upgradable buildings in Builder Base to have the fewest levels, which is 5.
  • The B.O.B Control is the third Builder's Hut that does not cost gems, the others are Builder Hall, O.T.T.O's Outpost, and B.O.B's Hut on the main Home Village.
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