HacX is a commercial add-on for Doom II. The gameplay is mostly the same - you run through levels, kill monsters and search for a keycard from time to time. The game contains completely new sprites and maps and uses the Doom engine. There are some new features, like destructible objects.
How to run this game on modern Windows PC?
People who downloaded HacX have also downloaded:
Hell to Pay, Heretic: Shadow of the Serpent Riders, Heretic, H!Zone, Hexen: Deathkings of the Dark Citadel, Hexen: Beyond Heretic, Hidden Below, The, Extreme Rise of the Triad
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