Traps are relatively inexpensive structures that remain hidden until they are activated by an attacking troop moving into their trigger radius. They can greatly improve the effectiveness of a village's defense if properly placed.
Traps do not light up the map like other buildings.
Traps are always ready for the next battle and do not need to be re-armed, unlike the ones in the Home Village.
Even though traps are classified as "Defensive Buildings", they are not buildings and do not need to be triggered/destroyed for your enemy to reach 100% destruction (nor do they count toward it).
Traps do not need the Master Builder to be available in order to be placed, however the Master Builder needs to be available to upgrade them.
Currently, all permanent traps have upgrade levels.
You can upgrade a trap once it is bought from the Shop. Buying the trap does not require the Master Builder; however, upgrading will.
Upgrade times are relatively short compared to building upgrades, taking at most 10 hours to build.
Traps have different upgrade types, with some traps increasing their affected housing space like the Push Trap while others dealing more damage, like the Mine.
Traps being upgraded are visible to enemies; it is usually a good idea to relocate them while they are being upgraded to ensure that enemies don't know where traps aren't. However, remember to replace them when it is finished upgrading.
Each trap must be upgraded individually. Upgrading one trap does not upgrade all traps of that type.
Traps have no effect on the no-spawn zone. Attackers can deploy troops on top of traps regardless of whether or not they are being upgraded.
Traps in the Builder Base do not require re-arming, unlike those in the Home Village. They will remain armed for the next battle.
Once a particular trap is upgraded, it is permanently upgraded. Upgrade levels don't disappear when it is triggered.