Half-Life: Day One

A Minor OEM version of Half-Life bundled with certain graphics cards and released by Sierra along with Team Fortress Classic as Half-Life: Initial Encounter, Half-Life: Day One contains the first four chapters of the full Half-Life game. It was never officially released as a demo, and Half-Life: Uplink performed this function instead.

Trivia

• Despite its name, Day One includes only a fraction of the game's true 'first day'.