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Half-Life 2 Hints
Rollermine
Health: special (see below)
Attack Damage: 10 from shock attack
First Seen: Highway 17, Section 4
These little rolling mine-like machines are usually found on roads. They like to attach themselves to cars that come along and knock them around with powerful electrical jolts. If this ever happens while you're driving the jeep, stop and get the rollermine off before continuing.
Rollermines will also target you if you come near them on foot, trying to hit you and deliver their charge into your body. However, they only have a limited scanning radius, and you can often get away from them. (Note that if you're driving the jeep, they can see you from much further away than if you're on foot.)
As for disposing of them, there's usually somewhere you can throw rollermines that they can't come back from (like into the ocean), so use the gravity gun to suck the mines in and then throw them away.
NOTE: Rollermines are immune to most weapons, but can be blown up with explosives. It's usually best to dispose of them as detailed above rather than waste ammo (though you could use explosive barrels and such if they're around).