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"The Star Laboratory searches the heavens for secrets to unlock a troop's full potential. Improve troop hitpoints, damage and housing space in addition to special troop abilities!"


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Ruin Level 1 Level 2 Level 3
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Level 4 Level 5 Level 6

  • Summary
    • It resembles an observatory but functions like the Laboratory.
    • The Star Laboratory is unlocked at Builder Hall level two.
      • It is automatically upgraded to Level 1.
      • At Builder Hall level one, it is ruined.
    • Troops are upgraded using Builder Elixir. Doing so may improve their hitpoints, damage, their special ability, or the number of the same type of troop that is able to fit into one Army Camp.
      • All troops unlock their special abilities at Level Two, the abilities improving as they are updated.

  • Upgrade Differences
    • Each time the Star Laboratory is upgraded (depending on what level) you can see Roman numerals (I-VI) in front that corresponds to the level of the Star Laboratory.
    • The star laboratory undergoes significant changes at on all of its levels.
      • At level 1, the star laboratory appears to be a building with a small telescope protruding through its top tied with ropes.
      • At level 2, the ladder is moved to the left side of the star laboratory with a ramp on the right.
      • At level 3, the telescope is longer and a ramp replacing the stairs on the left side. The door frames are also partially gold.
      • At level 4, the telescope is now golden along with the door frames and the ramp on the right side is replaced by a pressure gauge, similar to those on the Laboratory. The roman numerals also turn gold.
      • At level 5, the telescope becomes rotatable on top of the star laboratory using gears. The ramp on the left side turns into metal stairs.
      • At level 6, the telescope retracts into a larger telescope.

  • Trivia
    • Like the Clock Tower, it has Roman numerals corresponding to its level.
    • The Star Laboratory is the Master Builder's favorite building. This is mentioned in the tutorial.
    • All troops can be upgraded to level two without having to upgrade the Star Laboratory to match the Builder Hall level.
    • The Star Laboratory has the same research icon (with a sword and a spell bottle) as the Laboratory. However, the Builder Base has no spells.

  • History
    • The Star Laboratory was added on 5/22/2017.

  • Icon Descriptions
    Icon InfoTapping this icon displays information about the Star Laboratory, such as Level and Hitpoints.
    Icon UpgradeTapping this icon begins upgrading the Star Laboratory to the next level, if you have enough resources and a free Master Builder. When the Star Laboratory is at maximum level, this icon is not shown.
    Icon HoBTapping this icon instantly upgrades the Star Laboratory to the next level, at the cost of one Hammer of Building if you have one. When the Star Laboratory is at maximum level, 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.
    Icon ResearchTapping this icon opens up the Star Laboratory interface, allowing you to upgrade your troops' levels.


Builder Hall Level 1 2 3 4 5 6 7 8 9
Number Available 0 1 1 1 1 1 1 1 1
Size Size
4x4
Level Hitpoints Build Cost ElixirB Build Time Experience Gained XP Builder Hall Level Required
1 650 1,000 N/A N/A 2
2 800 15,000 10 minutes 24 2
3 960 50,000 30 minutes 42 3
4 1,152 300,000 8 hours 169 4
5 1,382 700,000 12 hours 207 5
6 1,658 1,000,000 1 day 293 6

Max Troop Level by Star Laboratory Level

The following chart lists the maximum troop level attainable by each Star Laboratory level.

Troop Star Laboratory Level
1 2 3 4 5 6
Raged Barbarian 24681012
Sneaky Archer 24681012
Boxer Giant -2481012
Beta Minion -2481012
Bomber - -281012
Baby Dragon - -281012
Cannon Cart - - -21012
Night Witch - - - -212

Upgrade Chart

The following charts lists the Star Laboratory level required, cost and time for each level of troop type.

Troop Type Troop Level
Raged Barbarian 23456789101112
Star Lab level 12233445566
Cost
ElixirB
3.5k6k9k50k100k300k330k700k900k1,000k1,200k
Time
Stopwatch
30sec5min15min3hr6hr1d1d2d2d3d3d
Sneaky Archer 23456789101112
Star Lab level 12233445566
Cost
ElixirB
5k8k12k60k120k320k350k800k1,00k1,100k1,300k
Time
Stopwatch
3min10min30min4hr6hr1d1d2d2d3d3d
Boxer Giant 23456789101112
Star Lab level 23344445566
Cost
ElixirB
20k40k60k300k320k340k380k100k1,200k1,300k1,500k
Time
Stopwatch
30min1hr2hr12hr12hr1d2d2d3d3d4d
Beta Minion 23456789101112
Star Lab level 23344445566
Cost
ElixirB
50k80k120k250k280k320k360k900k1,100k1,300k1,500k
Time
Stopwatch
1hr3hr5hr12hr12hr1d1d2d2d3d3d
Bomber 23456789101112
Star Lab level 34444445566
Cost
ElixirB
150k200k250k280k320k340k360k900k1,000k1,200k1,400k
Time
Stopwatch
6hr8hr12hr12hr1d1d2d2d2d3d3d
Baby Dragon 23456789101112
Star Lab level 34444445566
Cost
ElixirB
200k240k280k320k360k380k400k1,000k1,200k1,400k1,600k
Time
Stopwatch
8hr12hr12hr1d1d2d2d2d3d3d4d
Cannon Cart 23456789101112
Star Lab level 45555555566
Cost
ElixirB
400k500k600k700k800k900k1,000k1,100k1,200k1,400k1,600k
Time
Stopwatch
12hr1d1d1d1d2d2d3d3d3d4d
Night Witch 23456789101112
Star Lab level 56666666666
Cost
ElixirB
600k700k800k900k1,000k1,100k1,20k1,300k1,400k1,600k1,800k
Time
Stopwatch
12hr1d1d1d2d2d2d3d3d4d4d

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