First-person shooter. The player controls the actions of an in-game protagonist from a firstperson perspective. What the player sees is what the protagonist would see. Progression through the game largely involves forward movement through a series of areas within a government research complex. There is a limited need to interact with objects and the landscape. All versions of the game offer variations on a basic escape and evasion theme, with protagonists attempting escape from both human and

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... ien opponents after a scientific experiment goes badly wrong. Occasional excursions are made into an alien dimension. The three versions of Half-Life offer three varying perspectives on events: those of Gordon Freeman, a scientist involved in the experiment, Adrian Shepherd, a member of a military team sent in response to events, and Barney Calhoun, a security guard.