Half-Life may stand for:
Half-Life and its 3 expansions, Opposing Force, Blue Shift, and Decay, can be found under the page Half-Life. The engine remake, Half-Life: Source, can also be found on the page.
Half-Life 2 (2004-2007)
Half-Life 2 and its 2 episodic sequels, Episode 1 and Episode 2 can be found under the page Half-Life 2. Episode 3 can be found under the pile of Bigfoot skins and discarded magic wands in the corner.