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Half-Life: Opposing Force Hints
Alien Controllers (Xen Masters)
Alien controllers are aliens that fly around and toss glowing orange orbs at their enemies. They are the aliens that you first meet in the Lambda Sector's gateway to Xen, both in Half-Life and Opposing Force. Avoid the orange orbs and take aim at their massive skulls. Use the Mp5 to keep a constant wall of bullets up in the air for them to run into. Otherwise, don't worry too much about alien controllers. You only run into them during Gordon's infamous jump into the gateway to Xen.
