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The developers—many of whom held full-time jobs elsewhere—spent more time working on a commercial Half-Life title than many employees at Valve itself. The "Complete Beta" Milestone

The beta finally added the missing "Interloper" maps and the massive Nihilanth boss battle, making the game playable from start to finish for the first time. download-black-mesa-complete-beta

The , released in December 2019, was the final hurdle before the game's full 1.0 launch. For years, Black Mesa was "the game without an ending" because the final alien world, Xen , was being built from scratch. released in December 2019