Tense, atmospheric year-2000 PC horror that still holds up in the dark. Aliens vs. Predator Classic is the game that made people afraid to play as the Marine, and the soundtrack is a big reason why. "Derelict" nails that isolated, dripping-pipes-in-the-dark feeling with minimal synth work, and "Invasion" ramps into full survival panic mode.
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"Waterfall" on the Predator campaign shifts the tone entirely, something primal and hunting-focused. You feel like the threat instead of the prey. "Ferarco" on the Alien side goes abstract and alien in a way that actually makes you feel inhuman.
Three campaigns, three completely different moods. Essential if you want to remember when licensed games could genuinely terrify you.