The HλLF-LIFE series of games are based in a science fiction alternative universe, encompassing to date the Half Life games (1, 2, and episodic content) and Portal games (1, 2).

The Half-Life series begins in the early 21st century at the fictional Black Mesa Research Facility in New Mexico. The player, a silent protagonist named "Gordon Freeman", is involved in an experiment analyzing an unknown artifact; however, the experiment goes wrong, and opens a dimensional rift between Black Mesa and another world called Xen, causing monsters to swarm Black Mesa and kill many of the facility's personnel.

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