Half-Life: Day One

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Half-Life: Day One is a well-known demo of the blockbuster computer game Half-Life, which included the first fifth of the game and was often included with graphics cards.

Half Life: Day One was designed exclusively for OEM partnerships and was never available to the general public. Half-Life's actual demo (available free to the general public), Half-Life: Uplink, was released several months after Half Life: Day One.