You play as Dr. Gordon Freeman , a theoretical physicist at the top-secret Black Mesa Research Facility . During a routine experiment involving an "unstable" crystal, a massive "Resonance Cascade" occurs, tearing a rift between Earth and a hostile alien dimension called Xen .
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For a safe and reliable experience, the official platforms are your best bet. Because the game is older, it is often available for a very low price (sometimes under $1.00 during seasonal sales). You play as Dr
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Fight off alien headcrabs, zombies, and terrifying vortigaunts.
Deal with the HECU (Hazardous Environment Combat Unit), soldiers sent not to rescue you, but to silence all witnesses.