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Features      A completely reimagined and refined single player campaign, including all new and expanded Xen levels     19 chapters of fighting through top-secret labs, running atop harsh desert landscapes, sneaking into abandoned railways, and leaping across dimensions    Mind-Blowing graphics and effects, never before seen on the Source Engine    Face off against an army of classic enemies, updated with new features and engaging AI    Wield an arsenal of military hardware, scientific prototypes, and the iconic crowbar through incredibly detailed environments    The all-new soundtrack and voice acting create a more immersive experience than ever before    50 Fun and challenging achievements               Multiplayer   Frag your friends across  10  iconic maps from the Half-Life universe, including:    Bounce    Gasworks    Stalkyard    Undertow    Crossfire               Workshop   Create your own mods, models, and maps with the  Black Mesa  Source SDK, then share it with the community on the Steam Workshop.              Steamworks   Collect the full set of trading cards, backgrounds, emoticons, and achievements! 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