"Plan an explosive surprise for troops that get too close. Choose air or ground!
Mines are splash damaging traps that can be set to Air or Ground.
It cannot damage both air and ground.
Although not doing much damage, the Mines still have power in number and can take out support troops or hordes of low-hitpoint units.
Even though Mines are classified as "Defensive Buildings", they are not buildings and do not need to be triggered/destroyed for your enemy to reach 100% destruction.
The Mine explodes after an enemy comes within 4 tiles of it, causing splash damage to every enemy ground troop within 5 tiles. This delay means that you'll want to place the bomb in an area where troops are likely to remain for a period of time, like right next to a building they're attacking.
The Mine does not need the Master Builder for construction, however, the Master Builder is required for upgrading.
Try to use Mines on the outside of the map so it can severely damage sniping Sneaky Archers.
Setting Mines to Ground would better protect your base if you are losing to ground attacks. Setting them to Air would protect your base from air attacks, if you are losing against them. Set half and half if you are facing both type of attacks.
You can stop a Bomber from throwing its first bomb by placing a Mine near the area, which allows your defenses to one-shot it.
On level 1 to level 4 Mines, the timer's hand rotates as it ticks. This hand movement occurs even when the Mine is being upgraded.
Tapping this icon displays information about the Mine, such as Level, Damage Type and Targets.
Tapping this icon begins upgrading the Mine to the next level, if you have enough resources and a free Master Builder. When the Mine is at maximum level, this icon is not shown.
Tapping this icon instantly upgrades the Mine to the next level, at the cost of one Hammer of Building if you have one. When the Mine is at maximum level, this icon is not shown.
Tapping 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.
Tapping 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.