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Half-Life Hints
Alien Controllers (Xen Masters)
Alien controllers are perhaps the most annoying aliens you will meet. They attack in swarms, flying around and unleashing strings of glowing orbs that can do a bit of damage. Try to keep track of where the controllers actually are. This can be difficult, as the glowing orbs can block your view and disorient you.
Try to concentrate on one controller at a time rather than worrying about all of the controllers around you. Work on weakening the swarm of controllers until you have defeated them entirely. Any weapon works well, but the Mp5 is very useful in taking them out since it's usually easy to follow their flight path with it and riddle them with bullets. The gluon gun can be even more effective with large groups of controllers that you have to take down fast.