Blue: The mine is neutral and has not yet armed itself.Red: The mine is armed and considers whoever is close to it to be an enemy.Green: The mine is armed and considers whoever is close to it to be a friend.This system is signaled through a color-coded light at the top of the device: Thus, a mine placed by a Citizen with a Gravity Gun will attack Combine, and a mine dropped by a shield scanner will attack Citizens. The mines interpret a "friendly" unit as whichever faction placed it last. Hopper Mines use a friendly fire identification system which resets whenever they are picked up.
They are used both indoors and outdoors, mostly in vital choke-points and occasionally concealed as traps. Thus, they are used by the Combine almost exclusively to deter attacking enemy personnel, creating makeshift but often impassable barriers in seconds. Otherwise, they are impervious to nearly all forms of handheld weaponry, save for the Gravity Gun.īecause of their danger, immovability and extreme durability, Hopper Mines are impossible for most enemies to disable or defuse. They also detonate if smashed too violently. If the enemy target gets too close, the mines will toss themselves nearly two meters (six feet) into the air in the direction of the threat and explode upon contact with whatever they happen to hit on the way down. When an enemy target comes close, the mines light up and give off a warning chirp.
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