Updated for Town Hall 18 (October 2026).
The Builder Base Spring Trap is a hidden 1×1 trap that throws one ground troop into the air. Light troops (spring weight 4 or less) are launched off the map; anything heavier is stunned in midair and takes 100 to 400 damage depending on the trap’s level. Supercell reworked it on October 6, 2025, fixing its capacity at 4 and adding level 5 for Builder Hall 10.
How the Spring Trap works now
When a ground troop steps on it, the trap picks a single target and flings it. What happens next depends on how heavy that troop is:
- Spring weight 4 or less: the troop is ejected and defeated outright. In the current Builder Base that means Raged Barbarians (weight 4), Sneaky Archers (weight 3) and the Skeletons a Drop Ship leaves behind (weight 1).
- Heavier troops: they still go up, can’t move or attack while airborne, and take the trap’s damage when they come down. If that damage finishes them, they fly off the map like a launched troop.
- The Battle Machine: it can be thrown, but takes half damage and is never ejected.
Air units ignore it, so the Battle Copter, Beta Minions, Baby Dragons and Drop Ships fly straight over. The trigger radius is 0.7 tiles, small enough that a troop has to walk right across the tile.
Spring Trap levels and stats
Every level has a spring capacity of 4. Upgrades cost Builder Gold; placing a new level 1 trap is instant.
| Level | Builder Hall needed | Damage | Damage vs Battle Machine | Cost (Builder Gold) | Upgrade time |
|---|---|---|---|---|---|
| 1 | 3 | 100 | 50 | 10,000 | Instant |
| 2 | 4 | 175 | 87.5 | 30,000 | 1h |
| 3 | 6 | 250 | 125 | 100,000 | 1d |
| 4 | 8 | 325 | 162.5 | 300,000 | 2d |
| 5 | 10 | 400 | 200 | 500,000 | 3d |
How many Spring Traps you get
Two at Builder Hall 3 and 4, three at Builder Hall 5 and 6, four at Builder Hall 7, five at Builder Hall 8, and six at Builder Hall 9 and 10. From Builder Hall 6 on, each stage can hold up to 12 traps in total, so you choose how to split your six springs between Stage 1 and Stage 2.
Where to place Spring Traps
The trap now hits whatever steps on it, so it is no longer a dead tile against heavy armies. Still, its best moment is deleting a cheap troop for free, and its next best is stalling a tank for a second under fire.
- Single-tile gaps in your walls that lead toward a Crusher, Roaster or Mega Tesla. Troops funnel through the gap, and a stunned tank sits in the splash zone.
- The outer ring where attackers drop Raged Barbarians or Sneaky Archers to clear buildings. One spring removes a whole troop slot.
- In front of a Push Trap aimed at the spring, so pushed troops land on it.
Don’t stack several springs in one spot. Each one only takes a single troop, so a cluster gets spent by the first few units through.
How to play around Spring Traps
Send a cheap troop first along the path your main push will take, ideally something with weight above 4 that survives the damage. At higher levels, a lone Raged Barbarian is a fair trade if it clears the trap for your Power P.E.K.K.A or Boxer Giants. Sneaky Archers are the troop that loses the most to springs, so scout the gaps in walls before you commit them. The trap does nothing to air units, so an air-heavy army can ignore it completely.
What changed, and when
For most of the Builder Base’s life, the Spring Trap worked on spring capacity: its capacity grew from 4 at level 1 to 8 at level 4, it could launch several small troops at once, and anything heavier than its capacity walked over it untouched. Builder Base 2.0 in May 2023 left that behavior in place.
A bug that gave the trap unlimited pushing capacity was fixed in the June 16, 2025 update. Then the Ranked update on October 6, 2025 reworked spring traps in both villages. The Builder Base version got a fixed capacity of 4, damage against troops it can’t launch, and a new level 5 at Builder Hall 10. The Home Village Spring Trap received a matching rework plus levels 6 to 12. In April 2026, the Hammer of Building magic item started working on Builder Base traps.
Spring Trap FAQ
What does the Spring Trap do in the Builder Base?
It launches one ground troop. Troops with spring weight 4 or less are removed from the battle; heavier ones are stunned and damaged.
What is the max level of the Builder Base Spring Trap?
Level 5, at Builder Hall 10. It deals 400 damage (200 to the Battle Machine).
Can a Spring Trap kill a Boxer Giant or Power P.E.K.K.A?
Only if the hit finishes off a troop that is already low. Otherwise it stuns them and takes a chunk of health.
Sources: Supercell, Get Ready for Ranked update notes (October 6, 2025); Supercell, Let’s Get Crafty update notes (June 16, 2025); Supercell, Sound of Clash update notes (April 27, 2026); Supercell, Builder Base 2.0 patch notes (May 15, 2023); in-game data.
